>I have been using a graphing OCX which generally works fine. However on one machine only (out of 4), after leaving the screen that I use it in, there is one screen in my app. which always fails when I try to run it! This second screen is fine as long as I stay away from charting. Error message is: > >The program has performed an illegal operation and will be shut down... >VFP caused an exception 10H in module VFP.EXE at 0137:005c8e78...  >  >I have tried a second OCX and get the same error on a machine where the first OCX has never failed! I don't know if this will help but since no other answers came, I'll try. Do a search on SYS(3050) both in the VFP Help system and here on UT. That seems to help some OCX problems.