Lightroom not updating main preview with develop changes. Steps taken, please help...

I have CC photographers package with the latest Photoshop and Lightroom (5.7) installed. Starting yesterday when I make changes to the develop sliders the image doesn't change. The filmstrip preview does but the main preview does not. If I switch to a different image and back I can see the changes but I can't edit that way. I purged caches, increased their size, made a new catalog, uninstalled (and left over files) and ran CC cleaner on the registry then rebooted and re installed. I did not uninstall CC or Photoshop. How can I make the slider changes show up in real time again? It isn't that the changes are lagging. I can change a slider and it WILL NOT change the image no matter how long I wait, but if I switch to another photo and back the changes show up immediately. Searching Google yielded only results about smart previews and was not helpful to me. I am not using smart previews and the actual RAW files are on the same machine Thanks everyone!

I don’t know for sure, but if it just started, not when you installed LR 5.7, then something changed on your system.  A display-update issue would perhaps be related to video drivers, so did your system’s video drivers get updated, yesterday, or did you install some game that changed something?
About the only thing I can suggest in this regard is to try rolling back your video drivers or installing the latest video drivers from the video-card manufacturer’s site, or if they have a list of older drivers, archived, then try installing the preview version or two back.

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