AppKit Missing Symbol (Motion 5.1, etc related)

FCPX 10.1.1 now working w/o running the exec in DP2, a few app's that crash are reporting a missing framework, mostly media/pro-app's. Here's a snippet of the report:

Symbol not found: _OBJC_IVAR_$_NSScroller._target
Referenced from: /Applications/Motion.app/Contents/MacOS/../Frameworks//Ozone.framework/Versions/A/Ozone
Expected in: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
in /Applications/Motion.app/Contents/MacOS/../Frameworks//Ozone.framework/Versions/A/Ozone

It seems "Ozone" is either missing or the version is incompatible with Motion 5? A few hours of searching, someone mentioned ProKit may need an update, although I don't see the relation.

Any idea? Thanks!

(Mods: if this belongs in a different forum, apologies, I found the error related more to 10.10 than the app's themselves)