Yup, prior to having this problem, I had already done what you have suggested--the problem exists despite the fact that I had already installed the fix you mentioned. Of course, prior to installing that fix, there was no Painter 3D pop-up window available. Now, before I actually paint within Painter 3D for the first time, I have to tell RDS 5.5 exactly where the ".exe" is. I have to do this every time I reboot RDS 5.5.