I may have found an intermittent bug in 6.5.1 using Windows 8.1; the following line of script works sometimes:

   export snapshot from rect myGlobalRect to myImageData as PNG

but other times it gives me this error:

stack "My Stack": execution error at line 5 (export: no image selected, or image not open), char 1

The key thing here is that I am NOT exporting from an image or any other control, simply a rect in global coordinates from the screen, which in my case is still always over a Livecode stack.

I can't quite pinpoint how to repeat this either. Seems to come and go randomly. Ideas?

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