In my Mario Party 2 soundfont, there is an instrument titled MMX Hat. For some unknown reason, trying to play this sample back using virt. keyboard causes the program to crash. The sample plays back just fine under the Sample tree.
I tried playing back several other instruments with the virtual keyboard. Only this one seems to have this problem.
May be related: the key range box does not want to fill itself in with the default C0-G10 readout, for some unknown reason. The auto-fill will show up, but it won't stick. I successfully entered C0-G3 as a test, but trying to change it to C0-G10 after that did nothing. It always defaults back to whatever it said before trying to enter "C0-G10."
The sf2 is apparently too large to attach, and I don't know how to maximize a zip file's compression, but I don't know if copying the instrument into its own sf2 won't fix the problem. Which would be good in itself, but seeing as how it's a bug...