Garry wrote:
> Any idea what might be going wrong here? I checked other loggfiles and 
> couldn't find any further hints to the cause ... !?

OK, found the cause finally ... the USERNAME.seen file seems to have 
been corrupted, cyrus unable to recover (and obviously not attempting to 
just overwrite it with a working version), so after deleting it, cyrus 
finally created it newly, now it's back to working ...

-gg