It seems that now my computer has turned into another weird mode - the "backspace" (or delete) key has become the equivalent of a windows delete key (as in it erases from the front, not the back), my up/down arrows scroll all the way down instead of only scrolling a little, and my function keys have totally changed function - for example, F11, which is usually sound down is now making all the windows hide and go to the desktop! What is going on?? I checked universal access and languages. they all seem normal. is there a way I can reset?
If you are still typing the symbols described in your first post, that would seem to indicate that your Option/Alt key is permanently stuck in the down position.
One of the Macs at work is doing this exact same thing. Booting in Safe Mode eliminates the issue. So something within the system or system preferences is causing this. But I don't know what it could be.
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Keyboard reset to only type out strange character
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