Problem with decorations after upgrade from 14.10 to 15.04

I installed Ubuntu MATE 14.10 on a Dell Dimension B110 awhile ago at my office. I upgraded it to 15.10 and ran into some problems. The background on the home page is goofed up and so are some of the progress sliders. There will be pictures below. I don't want to reinstall. Any ideas on how to fix???

Bit confused about the progress bars because that is absolutely fixed in 15.10 :confused:

Does this machine by any chance have a nvidia graphic’s card. If so you may have to reinstall that driver for it to get it to work properly. Just a thought.

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