Application EventLog: could not write to log file: Bad file descriptor

Using postgresql 8.3 on windows 2003 server.  I keep seeing this message in my system log.   Checking the times, it seems to coincide with a log rollover each time, almost as though the db were trying to log something at precisely the same time as it is closing access to the old file, and before opening the new file.. and so fails to write..     does this make sense? has anyone else seen this? Solutions? Ideas?   I reduced logging, and disabled the debugging plugin (still don't know how that got enabled.. I must have missed something on the install).  Hope that helps....

Any ideas what is causing this error to be logged?
Cheers
Ati