Preview thumbnail sidebar fuzzy

Not sure what changed on my system but the sidebar in preview for thumbnails is for lack of a better word fuzzy.  see attached.  Any idea of what is going on here or better yet what the fix is?
OS: Yosemite
Macbook Pro 15 inch, early 2011
Processor: 2 GHz Intel Core i7
Memory: 8 GB 1333 MHz DDR3
Graphics: AMD Radeon HD 6490M 256 MB
Preview App Version: Version 8.0 (859.7)

Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J.  When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Remove the following. You may not find them all.
Containers/com.apple.Preview
Containers/com.apple.quicklook.ui.helper
Preferences/com.apple.Preview.LSSharedFileList.plist
Preferences/com.apple.Preview.SandboxedPersistentURLs.LSSharedFileList.plist
Saved Application State/com.apple.Preview.savedState
Credit Linc Davis  for this solution.

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