>we have a 5.0 application that was converted from 2.6 but still uses the foundation read. we get a GPF when few screens are open and we start closing them .. anyone help?

Unless you find someone who has already slain this dragon, this one will take som time to track down. See if you can find a consistent place (in code) that the program is crashing. If it seems to be more tied to a video event, start removing printer drivers, and switching video drivers to see if any of them get rid of the problem. Good luck.