i just pushed an update of nupas to sources. it fixes a few bugs, including - a recursive sync loop has been eliminated.. (this has been the source of some mystery crashes) - dualing upas/fs operating on the same mbox no longer miss deletions. the fix is less than elegant.
also on 27 jul, a crash with truncated mime sections was fixed. it might be that there is still a bug in imap that caused the original problem. but it could also be due to the recursive sync loop. thanks for the bug reports! - erik