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I can make this mass erasure happen every time with the following steps:
1) open BIAB
2) add chord somewhere
3) delete the added chord with the Delete key and add more chords
4) press F5 and click cancel => back to the same chords as after 2)

Janne,
Yes, that's it! I can reproduce that, and have fixed it for a patch t appear within a few days.
Many thanks!

As mentioned, if it happens, (before the new patch) you can do a Edit-Redo to get the information back.


Have Fun!
Peter Gannon
PG Music Inc.