hello Riamus,
1) it's interesting that the limit does not depend on the memory consumption of the image but on the image size in pixels. as to the max number of windows I can "background", there is no difference between an 8-bit gif and a 24-bit jpeg (same pixel size)
2) it confuses me that this limit, once it is reached, would apply in a new instance of mirc as soon as this 2nd instance is run in parallel to the 1st instance that caused the "background overflow". first I was thinking of some restrictions in winXP itself or in the graphic card. But in this case, bezillions of win users would run wild.
The reason why I'm interested in this issue: I always get a little bit nervous when I don't understand what's happening