By latest build I assume you mean TC, I'm using pro platinum 22.1 build 30.1, the AnimationLab is the one posted by Travis on the forum.
One thing I've not tested, I only recently got my spare computer working again which has Window 7 on, so I'll try installing 2015 and AL on that one and report back.
Note for IMSI, - its only a test I'll uninstall 2015 from it after testing so I don't break any licence agreement.
## Edit ## ok, just finished testing - using different computer, TC22.1 pro plat - build 30.1 Win7, 8 gig ram, graphics card not supported so used GDI mode, exact same results, undo buffer messed up in both script and keyframe editors, the only other test I can do is download the free trial of deluxe and try that. ## End edit ##