Starting just recently, upon closing FO4, I have been getting a popup window with the following text:

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Microsoft Visual C++ Runtime Libr. [That's the window header]

Runtime Error!

Program C:\Progra...

R6025

-- pure virtual function call

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I have no idea what this is about as I'm not a programmer versed in C++. All I know is that it happens ONLY when I close FO4. As far as I can tell, nothing in the game is being affected. But for whatever reason, C++ seems unhappy about FO4 being closed.

Any knowledgeable person out there that knows what this is all about?

One possibility would be: When you run out of memory and the engine doesn't terminate properly.

Do you have any mods btw?