To reproduce 1. Add a form with ribbon 2. Add one tab 3. Go to Code View 4. Go back to design time and add a group and a button in the group 5. Close design time and reopen it => the items are missing
Just to extend - on my form I had (parallel to Ribon) SplitPanel. After adding new groups and/or group elements everything in SplitPanel was gone. This is really critical as if somebody invest weeks in development everything can be gone in a second and yo