his dudeness,
This is a known bug, and we are already fixing it. The fix involves using a new flag in wx-2.5.2, wxFIXED_MINSIZE. The problem is that amule interface uses wxDesigner, and we are having some problems with it to put this flag, but we will eventualy work around this.
Wx-2.5.2 has other more serious issues relative to amule, so please, by now, either use wx-2.4.2 or wx-2.5.1. Soon we will have a full working 2.5.2 and up release.
Cheers!