Gunther, excuse me, I've already looked at all the previous faqs and I can not find the solution.
After having updated to version 4.7.5
It does not respond to the edition of the UI, I enter in Edit> configuration user interface size, change the size that always appears 2.0 to 1.0 and the image count starts in 1 (LR style), restart LRT following your indications.
  But the values are not updated.
I have already reinstalled LRT and updated DNG and JAVA x64.
This is the log file:
-----------------------------------------------------
Support request from user running evaluation version.

[2017-03-25 10:04:10] INFO: Log file was created at C:\Users\culir\AppData\Roaming\LRTimelapse\LRTimelapse.log
[2017-03-25 10:04:10] DEBUG: Loading properties from C:\Users\culir\AppData\Roaming\LRTimelapse\user.props
[2017-03-25 10:04:11] INFO: LRTimelapse 4.7.5 (2017-02-06) Build 133
[2017-03-25 10:04:11] INFO: © 2017 Gunther Wegner
[2017-03-25 10:04:11] INFO: https://lrtimelapse.com
[2017-03-25 10:04:11] INFO: Java version: 1.8.0_121-1-redhat (64bit) from Oracle Corporation
[2017-03-25 10:04:11] INFO: Running on: Windows 10 locale: es_ES
[2017-03-25 10:04:11] INFO: Windows architecture: 64 bit
[2017-03-25 10:04:11] INFO: Found 4 processor cores.
[2017-03-25 10:04:11] INFO: Java runtime: 64 bit
[2017-03-25 10:04:11] INFO: ------------------------------------
[2017-03-25 10:04:11] INFO: No License Key found. Running LRTimelapse unlicensed for EVALUATION.
[2017-03-25 10:04:11] DEBUG: Initializing directory chooser.
[2017-03-25 10:04:12] INFO: Done (dirchooser)...
[2017-03-25 10:04:13] DEBUG: Launching ExifTool: C:\Program Files (x86)\LRTimelapse 4\exiftool.exe
[2017-03-25 10:04:14] INFO: ExifTool: 10.20
[2017-03-25 10:04:14] DEBUG: Exif Tool available.
[2017-03-25 10:04:14] DEBUG: DNG Converter available.
[2017-03-25 10:04:14] DEBUG: MPEG Encoder available.
[2017-03-25 10:04:14] INFO: Detected 1 screen:
[2017-03-25 10:04:14] INFO: Screen 1: 1280 1024
[2017-03-25 10:04:14] INFO: Latest version: 4.7.5 (2017-02-06), current Version: 4.7.5 (2017-02-06)
--------------------------------
Thanks in advance
 Jesús Serrano

The settings are being saved in C:\Users\culir\AppData\Roaming\LRTimelapse\user.props
Make sure that this file is writeable, you might try to run LRTimelapse as administrator (option on right click on the icon) and see if that makes the settings being written.
If nothing helps (strange) edit the settings file with a text editor (like notepad++) and change the scaling factor. See if the editor can save.
You can as well delete the settings file, LRTimelapse will then create a new one.

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This post was last modified: 2017-03-25, 13:32 by abejarutas.

The settings are being saved in C:\Users\culir\AppData\Roaming\LRTimelapse\user.props
Make sure that this file is writeable, you might try to run LRTimelapse as administrator (option on right click on the icon) and see if that makes the settings being written.
If nothing helps (strange) edit the settings file with a text editor (like notepad++) and change the scaling factor. See if the editor can save.
You can as well delete the settings file, LRTimelapse will then create a new one.

sent mobile via tapatalk...

Fact! No doubt, Gunther you're the best!
After verifying that I was working as an administrator, in the end I edited the file with notepad and ... voila!
Everything works again.
Thank you very much, once more for your time.

Still it's strange, that the settings couldn't be written by LRTimelapse.

I have had a couple small issues with changing UI scaling up for 4k. nothing with permissions though. 
1. when inputting a value of 3.1-4.0 the dialog box pops up to alert me to input a value between 1.0-4.0. 3.0 works fine, possibly a mix-up in the dialog? changed setting in the .props file to 3.9 and saved and scaled no problem (turns out I don't need to go over 3 anyways).
2. The main reason I was still trying to scale up is due to the icons in the folder tree not scaling. Most important is the arrows to expand folders, but also including the folder icon. They are VERY tiny, and very tricky to click when on a 4k laptop display. Any suggestions? can send screenshot if necessary.
Thanks

This post was last modified: 2017-07-08, 14:27 by Gunther.

Thanks for making me aware of the inconsistence in the dialog vs. the accepted values. I'll change this.

Unfortunately the triangles and icons in the tree cannot be scaled currently. I will have a look, but since this is a standard UI component, I'm not sure, if I can change it.