SimonWM That's just my point. The program is not handling priorities right and it tends to lock out the mouse and screen updates (basically the whole UI thing) when those should be at the TOP of the program's internal priorities and background things like rendering and draping should be on the bottom of it. The priorities have been assigned upside down. And there's no cure for it short of going into the source code, setting them properly and recompiling it. You guys at CL hearing this?