Please download the new 3.318 installation program. Read this Thread for directions:
http://forum.mtu.com/showthread.php?t=9625.
We don't want any of the "old" 3.318 out there.
However, the problem you are reporting was not worked on in the new 3.318. I've emailed our lead programmer to review your thread. We'll be interested to see if anyone else reports the same problem.
If you can give us what Windows you are running, and the exact steps you use to create the problem, we'll hunt it down.