Hi Folks

I'm having a problem with my minimised Excel windows appearing as a black square with the file heading shown above it, rather than the window image. If I have an open Excel file on screen at the time then that minimised image is correct with any other Excel minimised windows black, but if I don't have an Excel file on screen then all of the Minimised windows are black.

It's only happening in Excel - any other minimised images are showing as correct. Any ideas please?