Hey All,

Just installed LR TL 4.6 Pro on a new iMac with the latest version of OS X. LR Time-lapse is very unstable, often freezes during use and restarts the computer, or it will be processing previews and the DNG converter quits and eventually causes the computer to reboot again.

Getting really annoying as I can't process anything.

Any ideas?

LR TL 4.6 Pro Build 111
OS X 10.11.5
4 GHz Intel Core i7 5k Retina

This is a report I've not heard of yet, so it might be something with your configuration, but hard to say.
Have you installed the latest Adobe DNG Converter? http://lrtimelapse.com/install

Yes - latest version of DNG.

This is becoming infuriating as I have a project to deliver by months end. Just tried again on a different clip and LR Time-lapse quit when processing previews. If I try to render tiff's out of LR it quits. I deleted the XMP's and tried again but no difference.

All software is up to date.

So system panics when making previews in LR Time-lapse or export 16 bit tiffs from LR:

Anonymous UUID: 9E3EE52E-8546-EB20-5D0F-BCBF805F52DD

Mon Jun 20 17:55:06 2016

*** Panic Report ***
panic(cpu 2 caller 0xffffff80113ce5fa): Kernel trap at 0x00000000504bfb60, type 14=page fault, registers:
CR0: 0x000000008001003b, CR2: 0x00000000504bfb60, CR3: 0x000000001577e000, CR4: 0x00000000003627e0
RAX: 0x0000000000000040, RBX: 0x0000000000000022, RCX: 0x0000000000000000, RDX: 0xffffff801192b780
RSP: 0xffffff93be713f68, RBP: 0xffffff8011301d46, RSI: 0xffffff80113056cf, RDI: 0xffffff801130587c
R8: 0x0000000000000002, R9: 0xffffff83aef1d068, R10: 0x0000000000000000, R11: 0x0000005461e86de8
R12: 0x0000000000000002, R13: 0xffffff80504bfb60, R14: 0x0000000000000000, R15: 0xffffff93be713f90
RFL: 0x0000000000010296, RIP: 0x00000000504bfb60, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0x00000000504bfb60, Error code: 0x0000000000000010, Fault CPU: 0x2, PL: 0

Backtrace (CPU 2), Frame : Return Address
0xffffff93be713bf0 : 0xffffff80112dab12
0xffffff93be713c70 : 0xffffff80113ce5fa
0xffffff93be713e50 : 0xffffff80113ec463
0xffffff93be713e70 : 0x504bfb60
Unaligned frame
Backtrace terminated-invalid frame pointer 0xffffff8011301d46

BSD process name corresponding to current thread: kernel_task

Mac OS version:
15F34

Kernel version:
Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64
Kernel UUID: 7E7B0822-D2DE-3B39-A7A5-77B40A668BC6
Kernel slide: 0x0000000011000000
Kernel text base: 0xffffff8011200000
__HIB text base: 0xffffff8011100000
System model name: iMac17,1 (Mac-B809C3757DA9BB8D)

System uptime in nanoseconds: 362419896525
last loaded kext at 7359271316: com.apple.driver.AppleHSBluetoothDriver 86 (addr 0xffffff7f934fa000, size 53248)
last unloaded kext at 126772895498: com.apple.driver.AppleFileSystemDriver 3.0.1 (addr 0xffffff7f93d5f000, size 8192)
loaded kexts:
com.apple.driver.AppleHSBluetoothDriver 86
com.apple.driver.AudioAUUC 1.70
com.apple.driver.AGPM 110.22.0
com.apple.driver.ApplePlatformEnabler 2.6.0d0
com.apple.driver.X86PlatformShim 1.0.0
com.apple.filesystems.autofs 3.0
com.apple.driver.AppleOSXWatchdog 1
com.apple.driver.AppleMikeyHIDDriver 124
com.apple.driver.AppleMikeyDriver 274.9
com.apple.driver.AppleHDA 274.9
com.apple.driver.AppleGraphicsDevicePolicy 3.12.7
com.apple.driver.pmtelemetry 1
com.apple.iokit.IOUserEthernet 1.0.1
com.apple.driver.AppleUpstreamUserClient 3.6.1
com.apple.iokit.IOBluetoothSerialManager 4.4.5f3
com.apple.kext.AMDFramebuffer 1.4.2
com.apple.Dont_Steal_Mac_OS_X 7.0.0
com.apple.driver.AppleHV 1
com.apple.driver.AppleIntelSKLGraphics 10.1.4
com.apple.AMDRadeonX4000 1.4.2
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport 4.4.5f3
com.apple.driver.AppleIntelPCHPMC 1.1
com.apple.driver.AppleMCCSControl 1.2.13
com.apple.driver.AppleSMCLMU 208
com.apple.driver.AppleThunderboltIP 3.0.8
com.apple.kext.AMD9000Controller 1.4.2
com.apple.driver.AppleIntelSKLGraphicsFramebuffer 10.1.4
com.apple.driver.AppleIntelSlowAdaptiveClocking 4.0.0
com.apple.iokit.SCSITaskUserClient 3.7.7
com.apple.driver.AppleUSBStorageCoexistentDriver 3.7.1
com.apple.driver.AppleTopCaseHIDEventDriver 86
com.apple.driver.AppleUSBTopCaseDriver 86
com.apple.iokit.IOAHCIBlockStorage 2.8.5
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless 1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0
com.apple.BootCache 38
com.apple.iokit.AppleBCM5701Ethernet 10.2.0
com.apple.driver.AppleSDXC 1.7.0
com.apple.driver.AirPort.Brcm4360 1040.1.1a6
com.apple.driver.AppleAHCIPort 3.1.8
com.apple.driver.AppleRTC 2.0
com.apple.driver.AppleACPIButtons 4.0
com.apple.driver.AppleHPET 1.8
com.apple.driver.AppleSMBIOS 2.1
com.apple.driver.AppleACPIEC 4.0
com.apple.driver.AppleAPIC 1.7
com.apple.nke.applicationfirewall 163
com.apple.security.quarantine 3
com.apple.security.TMSafetyNet 8
com.apple.driver.IOBluetoothHIDDriver 4.4.5f3
com.apple.kext.triggers 1.0
com.apple.driver.DspFuncLib 274.9
com.apple.kext.OSvKernDSPLib 525
com.apple.iokit.IOSerialFamily 11
com.apple.driver.CoreCaptureResponder 1
com.apple.iokit.IOSurface 108.2.1
com.apple.driver.AppleGraphicsControl 3.12.8
com.apple.iokit.IONDRVSupport 2.4.1
com.apple.iokit.IOBluetoothHostControllerUSBTransport 4.4.5f3
com.apple.iokit.IOBluetoothFamily 4.4.5f3
com.apple.driver.AppleHDAController 274.9
com.apple.iokit.IOHDAFamily 274.9
com.apple.iokit.IOAudioFamily 204.4
com.apple.vecLib.kext 1.2.0
com.apple.driver.AppleSMBusController 1.0.14d1
com.apple.driver.AppleSMBusPCI 1.0.14d1
com.apple.kext.AMDSupport 1.4.2
com.apple.AppleGraphicsDeviceControl 3.12.8
com.apple.iokit.IOAcceleratorFamily2 205.10
com.apple.iokit.IOGraphicsFamily 2.4.1
com.apple.driver.X86PlatformPlugin 1.0.0
com.apple.driver.AppleSMC 3.1.9
com.apple.driver.IOPlatformPluginFamily 6.0.0d7
com.apple.iokit.IOSlowAdaptiveClockingFamily 1.0.0
com.apple.driver.AppleThunderboltEDMSink 4.1.1
com.apple.iokit.IOSCSIBlockCommandsDevice 3.7.7
com.apple.iokit.IOUSBMassStorageClass 4.0.2
com.apple.iokit.IOUSBMassStorageDriver 1.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily 3.7.7
com.apple.driver.usb.IOUSBHostHIDDevice 1.0.1
com.apple.driver.AppleHIDKeyboard 181
com.apple.driver.AppleMultitouchDriver 304.12
com.apple.driver.AppleHIDTransport 5
com.apple.driver.usb.cdc 5.0.0
com.apple.driver.usb.networking 5.0.0
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com.apple.driver.AppleThunderboltDPInAdapter 4.1.3
com.apple.driver.AppleThunderboltDPOutAdapter 4.1.3
com.apple.driver.AppleThunderboltDPAdapterFamily 4.1.3
com.apple.driver.AppleThunderboltPCIDownAdapter 2.0.2
com.apple.driver.CoreStorage 517.50.1
com.apple.driver.AppleThunderboltNHI 4.0.4
com.apple.iokit.IOThunderboltFamily 6.0.2
com.apple.iokit.IOEthernetAVBController 1.0.3b3
com.apple.iokit.IO80211Family 1110.26
com.apple.driver.mDNSOffloadUserClient 1.0.1b8
com.apple.iokit.IONetworkingFamily 3.2
com.apple.driver.corecapture 1.0.4
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com.apple.driver.usb.AppleUSBXHCIPCI 1.0.1
com.apple.driver.usb.AppleUSBXHCI 1.0.1
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com.apple.kec.Libm 1
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LR just froze again exporting a sequence as 4k jpg's.

But this seems to be rather a problem with the Adobe Software on your system then with LRTimelapse.
You say your system freezes when a) Creating Visual Previews: this is the Adobe DNG Converter or b) Exporting from Lightroom - this is Lightroom.
I know that this doesn't help you with your problem, I'm just trying to sort out the reason for what you are experiencing.

Lightroom is know for not being very stable when using the graphics accelleration introduced with LR6/CC. You might try turning this of in Preferences/Performance. In LRTimelapse expert Settings you could lower the number of threads used for visual preview creation, set it to 4 if higher.

It could be your hardware too - maybe a thermal problem or a faulty memory brick. Both - LRTimelapse's Visual Preview creation and Lightroom Export will put it to massive stress. This could reveal problems that are not noticeable otherwise.

Graphics acceleration was turned off, does it with it turned on.

Swapped out various memory, no difference.

System can playback 4k video via Final Cut with plugins with no issues. It also has a AMD Radeon R9 M395X with 4Gb of Ram so system stress isn't an issue here.

Playback will normally not stress the processor that much. But I can only guess - I honestly don't know what's happening there. I quite sure it's not a LRTimelapse issue because LRTimelapse runs in a virtual java environment. If it crashes due to a programming bug, it will crash inside the virtual machine and generate an error log. The computer keeps running.
In your case the whole process or computer seems to freeze, this is a strong indicator that something else is wrong.