[syslog-ng] Expanding $PROGRAM and $FACILIITY macros with empty log messges

hi all, i'm running syslog-ng-1.4.2 and I am having a problem with macro expansion an blank log message causes the problem. here is an excerpt from my logs: note, mathlog-pc is our central logging server, it is also running syslog-ng (same version) but is UDP forwarding all logs to the log server Apr 5 08:28:40 src@fret340f-pc/fret340f-pc Apr 5 08:28:40 src@mathlog-pc syslog-ng[1793]: Cannot open file /var/log/syslog-ng/2000/04/05/fret340f-pc/p/ for writing (Is a directory) Apr 5 08:28:40 src@fret340f-pc/fret340f-pc syslog-ng[4481]: Cannot open file /var/log/syslog-ng/2000/04/05/fret340f-pc/ for writing (Is a directory) Any help on this is appreciated. Thanks, Jason