I have an occasional problem when executing long-running macros. Sometimes, and there is no consistency to it, the Excel window blanks out entirely, just showing a white screen, till the macro completes. Next time it works fine, the next time it happens at a different time, etc.
I have screen updating turned off during the execution of the macro, but I do have it turn on and then off again at times to show the interim results.
Any ideas what is happening here, and how to prevent it?