I've tried many different versions of NeoGamma with many different settings trying to figure out why my codes aren't being enabled for NSMBW. I may have found the problem. I added several codes to my txt list and the list is 2.58KB. But when I chose my codes and exported to GCT, the GCT is only 40 bytes! There's no way the codes could be in there, it's just too small. Something not working right with the cheat manager?
If you have the latest version, it should be working :-\
try making sure you checked the ones you wanted ::)
Compiled a new list and now it's working! Not sure why it wasn't before. Clearly NeoGamma's getting the codes from the txt file.