We have a rather large application that we are working to convert to VB.Net from VB6. It is infested with an older third party grid control that we were hoping we could replace gradually instead of all at once. The company that created the control has ceased to exist, to put it nicely. The program runs fine on Vista and earlier, but when we install and run on Windows 7, none of the grids show up anywhere in the program. The program doesn't spit back any errors, and all other functionality seems o.k, it's just the grids that don't show. I have created a simple program that is just one form, with one grid on it, and even that won't work. Very strange. Ideas anyone?