sun xemacs 21.4

In sun xemacs 21.4.6 (also noticed in 21.4.4) I work for a while and then I start getting messages like: Cannot write backup file; backing up in ~/%backup%~ Removing old name: No such file or directory, /home/jeff/mail/folders/#tmp#0 Quitting... Stuffing attributes... Saving... Cannot write backup file; backing up in ~/%backup%~ Auto-saving...error for INBOX Auto-saving...error!for INBOX Removing old name: No such file or directory, /home/jeff/mail/folders/#tmp#0 Auto-saving...error for INBOX Quit Opening output file: Too many open files, /home/jeff/.xemacs/.recent-files.el Quit The only message that means anything to me is "too many open files". Is it possible that xemacs is not closing some internal files? Other than that, I am somewhat at a loss to track this down further. FWIW, I've run both 21.4.6 and 21.4.4 on windows and have never seen this problem. I also have not seen this problem in 21.1.x on sun. -jeff