I have had this changing itself back. I don't know what triggered it but maybe some other program you have used auto sets it to it's prefered settings.

Dale, I know its not MTU, Just don't know why changes never stayed. I never looked at that as a problem because I know I made the changes. I never have been able to use anything higher then 4.03 until now. I'm really excited. I as well as my clients LOVE this program. Just letting MTU Be aware that if you have NVidia, you might have to change it in NVidia setup, Not windows.