I'm using IDL DE 7.1.1 on Vista 64-bit. I have a program which uses widgets to apply certain fits and display some astronomical maps through an iterative process. After each iteration the program updates the display to show the new fits. I also have a widget button which starts the whole process. When I first start up the program, and start the fitter everything works fine.. The program goes through about 100 iterations and updates the display each time. If, afterwards I try to run the same fit again the display won't update at all until the program is finished. The program itself runs, and does what it's supposed to. However, the widget window turns gray and gets a "not responding" message from Vista. Only the final iteration actually gets displayed on the window. If however, I simply restart the program everything works fine again. I think that for some reason, vista is not getting a response from the widget window while the program is working the second time I run it and assumes that the program is inactive. Is there a way to fix this? Has anyone encountered anything similar? thank you.