I would not suggest to Roll Back to the Previous Version.
Could you please try to Reset the Preferences of Lightroom once, and then try.
Let me know if it helps.
Thank You Tauj. The good news is that this seems to have partially fixed the problem.
Lightroom now recognizes the camera, which no longer disappears from the list of sources.
The only downside now is that Lightroom struggles to import. It used to import 15-20 raw images in no time and now it takes 15-20 minutes to import two photos.
Also it struggles to provide preview images and fails part way through and just lists most photos as "preview unavailable."
Meanwhile my Mac photos instantly builds all 150 preview images. Lightroom was always faster and more capable, but suddenly seems to really struggle. Is it because the Canon is a few years old?
Lightroom struggles to build 20 previews at a time and then gives up and just states that previews are unavailable so I am left to guess which gray squares are the ones I want to import.
Is it possible that CC needs a special driver to support Canon EOS 7D?
I tried uninstalling and reinstalling lightroom and clearing out all the preferences as suggested.
I just don't know why CC is struggling so much. I had this problem when CC first was launched and rolled back to LR5 and it solved everything. Sadly I accidentally updated to CC this week and all the problems are back.
I am sending you a Private Message, please reply.
After reseting preferences and recalibrating monitor I can technically import photos from my camera, but it is painfully slow. Importing two photos from my camera takes the same amount of time that Lightroom 5 took to import 30 photos. Also, when importing Lightroom is unable to display any preview thumbnails. See example here: Dropbox - Screen Shot 2016-01-04 at 3.54.30 PM.png
This correct answer is not complete.