2010 Mac Mini OS 10.10.1 screen is stretched out

Hi,
I have a 2010 Mac Mini that I use at work and I also use a second monitor via an adapter through USB. The setup worked until I installed Yosemite (10.10.1) on Friday.
When I go to Settings / Displays I don't get all the resolution options I had before (for my main monitor, 20", res. 1680 x 1050) and my secondary monitor isn't recognized at all (as if it wasn't even connected).
This is my main monitor: http://www.pcworld.com/product/1417007/lg-l203wt-widescreen-lcd-monitor.html
I've tried resetting the PRAM but that didn't work. I'm a designer and I can't work with my screen stretched out.
Can anyone let me know if there is a way to fix this???
Thanks in advance!

Look for update software for the USB video adopter.
The 2010 mini has an HDMI video adopter and came with a HDMI to DVI adopter, It also has a mini displayport video output. You can get an adopter to connect HDMI, DVI and VGA,
Mini DisplayPort with support for up to 2560-by-1600 resolution
HDMI port with support for up to 1920-by-1200 resolution
DVI output using HDMI to DVI Adapter (included)
VGA output using Mini DisplayPort to VGA Adapter (sold separately)
Support for extended desktop and video mirroring across both ports

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