@MISV, I just used fpcupdeluxe the other day to set up trunk Laz+FPC, x64, Cocoa.
I got the Arithmetic error, hit ok and got into the editor, then did a rebuild the IDE way with the same settings, and after that it's been working fine.
No go on Anchordockdsgn though, totally unusable at the moment, but apart from that it's been working well, including compiling apps for x64 Cocoa.