Same problem. Didn’t want to delete the whole preferences folder and have to recreate settings.
So I made a backup and edited two of the preferences file to delete CrossFade specific sections. That fixed it. These I guess were inherited from a previous install, and the new version stumbled over some historic detail.
Sections I deleted (you can find them by just searching for CrossFade):
UserPreferences.xml
Group / PCrossfadeEditor
and in Defaults.xml
Group / MCrossfadeEditUnitController
Hope it helps someone else too…