Thanks! Yeah, I wrote the network myself. It's a really basic feed-forward network so it's nothing special or overly complex, just a nice little exercise for myself to play around with and learn more about machine learning.
It would be nice if you could send me the error.log to keiwan@gmx.de. I'll try to take a look and see if I can figure out the problem once I have time to work on this project again (probably some time around the end of February).