Yeah, sounds like you inadvertently hit F10. Hit it a couple more times to get back to the custom display settings for your windows.
There are three different display settings controlled by F10: the most commonly used one takes any custom opacity/transparency settings into consideration, another one (which you are probably seeing) turns off any of the custom settings and shows all the windows, and the third one disables the UI (so you only see the game world graphics).
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