One thing I've experienced is not being able to export VST files with the beta.
I made a new folder in my Cabbage64dir called "ver2" and put the beta files there. It opens and i'm able to work within Cabbage 2 without issue.
When I export, the vst files are not working. Ive tried Reaper and Mixbus, both have not worked for me.
Don't know if you seen this issue on this pre release.