My problem is the application which works fine on Win95 and before is hanging when used on a Win 2000 PC. The user will click on a button and the application will proceed to what it's designed to do. Then the user will back out close the applciation, restart and when they use the same button all they get is a blank frame. I have recreated the the application on a Win 2000 PC and still have the same problem. Are there any known problems with 4.0 and Win2000?