Music Box Composer

When I press rec, MBC tells me it's recording, then that it is recorded, but the file is not created. I recorded last week and it was working perfectly. I don't know what changed. The MIDI out is still working, but not the WAV. I restarted my mac, still not working. I wonder if I uninstal and reinstal MBC, but I don't know if my registration code will still be working.

What can I do?

I use MBC on a macbook pro, mid 2012, OSX 10.8.3

Thank you

I think it has something to do with another software on my mac : xvx Panel. I played with the software a while and now it's working. I don't understand why, because it works even if xvx Panel is closed or opened.
Whatever, if the bug ever comes back and that I don't know what to do, I will tell you.