2013 Standard - freshly upgraded from 4.3. Only customization is tab stops on AP Invoice Data Entry header for all user/all companies, which, by the way, I needed to reset post-upgrade. During a trouble-shooting exercise, I am remoted onto a user desktop, logged in as myself (all rights). Open APIDE, have her press Ctrl+F9. Get message that ""Custom Office Panels cannot be customized"". But if I launch Customizer Selection, I can create a new customization. I remote to their server. launch APIDE, press Ctrl+F9, and get the second of the attached screen shots. So, this time, it doesn't see the existing customization. I can't duplicate on my local or our internal system. Anyone run into these situations? Can't find the ""cannot be customized"" message on the KB.