The GExperts Installer creates a different entry under
HKCU\Software\Embarcadero\BDS\<version>\Expert </version>
than the Expert Manager. This can result in two different entries for GExperts which in turn will create the error:
"PrivateGXMenuActionManager is not nil upon creation" when starting the IDE.
Workaround: Use the Registry Editor to delete one of these entries.
fixed in revision #2576