MBP won't use full external display

Hello,
I got home today, turned on my computer while connected to an external monitor and all of a sudden, my MBP (13", late 2011) won't use the whole display. Instead the screen is squashed and i got two black gaps on either side of the monitor. The resolution is set to 1920*1080 as always, so that isn't the problem. Also, when I set the monitor to all other resolutions, it stretches all the way out, it's only on 1080 it doesn't work even though 1920*1080 should fill out the whole screen, while some of the other resolutions shouldn't. I have the displays set to extend, so the MBP's display is set to 1280*800 as usually, and everything functions perfectly on both displays except for the gaps.
I've tried closing the lid and playing around with the external monitor itself, but I get the same results. I've also reset the PRAM and SMC; same thing.
I can also add that on the Windows part (Boot Camp installed) it just plain won't recognize the external display at all. Everything worked this morning...
Thanks in advance!

Wow, excuse me, figured it didn't matter much, given that is has worked flawlessly before. Just figured it was a software issue. Anywho, external monitor is an Acer P246H 24" I believe.
I have tried the detect displays too, and I've also tried and see whether it was the monitor tuning in weirdly on the resolution, but it doesn't even have an option to squash the image, only move it side to side.
Since it is a plug and play screen, and it has worked before, I figure it will work again, if there is someway to reset the drivers and make the computer reset it's external display settings so that it will just recognize the display as a new one the next time it is plugged in? The WIndows and OS X problem happened on the exact same time though (after i rebooted from Windows into OS X after not being able to connect, the resolution problem came).

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