So, I've had this problem for quite some time, but never got any feedback on it. Basically, whenever I copy a frame it glitches out and deletes most of the frames. When I try to add or delete frames, it does nothing. It came up with a lua error, here's what it said:

[Stop Motion Helper] lua/smh/rxlua/rx.lua:86: lua/smh/client/derma/frame_pointer.lua:90: attempt to perform arithmetic on local 'position' (a nil value)
1. _onError - [C]:-1
2. onError - lua/smh/rxlua/rx.lua:86
3. tryWithObserver - lua/smh/rxlua/rx.lua:19
4. _onNext - lua/smh/rxlua/rx.lua:498
5. _onNext - lua/smh/rxlua/rx.lua:77
6. onNext - lua/smh/rxlua/rx.lua:77
7. Position - lua/smh/rxlua/rx.lua:1971
8. createUiFrame - lua/smh/client/derma/smh_menu.lua:183
9. _onNext - lua/smh/client/derma/smh_menu.lua:210
10. onNext - lua/smh/rxlua/rx.lua:77
11. ActiveFrames - lua/smh/rxlua/rx.lua:1971
12. Function - lua/smh/client.lua:59
13. _Apply - lua/smh/bivalues/bivalues.lua:281
14. _ApplySynced - lua/smh/bivalues/bivalues.lua:260
15. func - lua/smh/bivalues/bivalues.lua:386
16. unknown - lua/includes/extensions/net.lua:32

Hoping for some help, it's getting very annoying.