> I don't know what's going on, but just in the last few minutes, when I try to play > MAME, the screen is rotated 90 degrees either to the left or right. I haven't changed > any rotation settings that I'm aware of. It started after I tried to play Tempest. > Even the main MAME menus are rotated to the left.
I'm going to guess that you did the 'magic' key combo that your video card (betting some flavor of Intel?) takes to dynamically rotate your entire screen. I think the combo is CTRL+ALT+(UP/DOWN/LEFT/RIGHT), depending on how you want the screen to be presented. You have two options - remap your keys to avoid possibility of using these all at once or disable your Rotate.
http://www.techbuzz.in/enable-screen-rotation-to-flip-rotate-windows-screen-90-180-270-degree.php
If you don't have Intel graphics, look to your local video card software/driver settings for disabling this.
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