Fill/stretch do seem to cause some messed up background imagery.
Win98SE, 6.15 (Caused by using /background -f
and then resizing) :
Actually there's a small chance that this is my computer being weird, it wouldn't be the first time. So if nobody else can reproduce that kind of weirdness then it's probably not a bug in mIRC, just my computer.Edit:
For me the bug only occurs in desktop windows. Regular windows behave just fine.