Hi

Loading JPEG files that have no metadata (removed after exporting from LR5) seems to make the files go out of sequence even though they have been labelled sequentially.  I have sort by filename switched on.

Any reason for this?

Thanks
Andy

Update: Tried original files .nef with all the metadata and still same issue.

MAC 10.10.5 issue?

There is a checkbox that allows you to switch between Sort by date/time and sort by Filename right on the top left of the table in LRTimelapse.
Date/Time only works with Exif-Data present, of course.
If you use Filename sorting, make sure to have the files names so that they can be sorted alphabetically.

This will work:
file0001.jpg
file0002.jpg
file0010.jpg
file0100.jpg

This won't:
file1.jpg
file10.jpg
file100.jpg