This is really not a bug, i think probably something related to the java handling of windows filesystem.
The issue is this: if i create a new folder in windows, when LRTimelapse is open, the software dosen't seems to see it. The only solution was to restart the software.
dont know if it's only for windows, and if it's a solvable issue, but really it isn't so important

That's the reason you see that little "refresh" icon on the top right of the folder chooser. This will update the folder tree. Unfortunately I didn't find a better solution yet.