There was a major bug in yesterday’s experimental GExperts release 1.38 2016-01-09.
As discovered and reported by +Karheinz Jansen the Delphi IDE could crash when closing and show cascaded access violations. This was caused by a bug in the handling of dockable forms, which has now been fixed.
And since I was at it, I also added the missing icon for the new bookmarks expert.
Head over to the Experimental GExperts page to download it.