A couple of bugs I witnessed had to do with User button:
1. The User button did not turn red if the user's phone was unplugged
2. The User buttons could not be edited or changed without removing all User buttons first, then merging, then re-programming the User buttons with the required changes.
I have only installed two small systems with no more than 8 digital phones each and analog trunks and not many features so there could be more wrong with this release than I saw.