[Xymon] what am I missing?

I'm sure I'm just missing something simple...I have the following in my xymonserver.cfg file:

MAXMSG_STATUS=640 MAXMSG_DATA=640

yet the xymond.log file is complaining that it's receiving an "Oversize data/client msg from 123.123.123.123 truncated (n=551425, limit 524288)". I had set the limit to 512 but then upped it to 640.

What did I miss?

=G=