Hukker, there are really only two things you can do right now. Wait until 6.3 comes out and produces crash dumps in the /logs dir and then ftp it to me or grab the debug version earlier in this thread and wait for it to crash, collect the files, and ftp it to me
6.3 will also contain more detailed crash dump information besides the dump file so even simple cut/paste of error information to here will be much more useful.
Grab the debug version, get it to crash, PM me, ftp it, and then I can debug it. That's about the only way I can debug w2k3 ioFTPD installs since I'm not running w2k3 locally.