Blame it on Boston. Or that I was visiting my parents in Connecticut for a long weekend and didn’t open ArchiCAD 15 yesterday. Either way, I’m a few days behind on learning that ArchiCAD 15 Hotfix-4 package (Build 3898) has been released (came out on June 28th). You can read about all the details and download the hotfix (if your ArchiCAD isn’t set to automatically notify you) here. Remember to update everyone using Teamwork 2 (including the BIM Server) at the same time.