https://bugs.winehq.org/show_bug.cgi?id=32893
--- Comment #6 from Mark K markk@clara.co.uk --- Also, if load/run a ROM, pause emulation (Emulation->Pause menu), then minimise the emulation window and restore it, the window contents are blank.
If I then click in the menu bar to open a menu, and finally move to show a different menu, then the emulation window contents appear again.