Step 1 :
Join two channels.
Step 2 :
query nickname
Step 3 :
dcc chat nickname
On dcc chat window opening, the background for the query window will disappear. i.e. the gif/jpeg you have assigned will be lost, and the default background color will appear.
I'm not sure what else I can add, but it's something that happens virtually every time I connect.
I have a clean WinXP system and run Sophos antivirus.
Thanks
-Ivan.