I successfully followed the following answer to Add Dropdown Menu to CRM 2011 ribbon and implemented three dynamically loaded FlyoutAnchor buttons with sub menu buttons etc.
Yesterday the sub menu buttons were working fine (click event was fired etc), but after a re-import of the solution with the Ribbon XML etc the sub menu buttons were telling me (in the tooltip) that they are disabled. The exact message is "This button is currently disabled. You may not have selected the item that works with this feature. If you don't have permissions to use this feature, contact your system administrator".
So I reverted back to the previous Ribbon XML, but the sub menu buttons remain disabled. It looks like I hit the same issue as described in the following thread: CRM 2011 Dynamic Ribbon disabled HELP!!. But I already have Rollup 6 installed on my server, so this shouldn't occur.
I already tried resetting IIS and re-importing the solution (multiple times). I also checked/added the <EnableRule Id="Mscrm.Enabled" /> rules etc.
I can't get the sub menu buttons enabled again. What am I doing wrong? Please help me.