Here's a sample output of a test:
server50.mydomain.com:green Wed 20 9:45:22 2011 [server50.mydomain.com]<center><br>No current messages.</center>
Note: The test is being run on server1 but it is testing some functionality on server50 (which is an appliance that can't run xymon client) and reporting it as server50.
Are you sure about the "<servername>:color" syntax in the output file ? I haven't seen that before - I assumed BBWin would always report the status-messages as belonging to the host that BBWin runs on (picking up the status-name from the name of the outputfile).
If I am right, then Xymon sees a status with an unrecognizable color-name, and therefore the message is discarded.
Regards,
Henrik