I'm not sure. aMule 2.1.3 does indeed work with newer wx versions, but with SVN versions there seems to be a problem upon widget creation or something. (The pointer to the validator of _all_ widgets in the preferences is 0x01, which is a serious problem.)
Kry is currently busy again, but he wants to adjust the aMule sources to compile with Visual Studio, which features a superior debugger on Windows. I had no luck with (mingw) gcc 3.4 and 4.2 and gdb was unfortunately not usable.