When I tether to lightroom cc with my canon eos 7D, The photos show up as just grey boxes. no photo shows. file is saving in the proper destination folder and opens with photo mechanic, but not showing up in lightroom. was working fine until 2 weeks ago when this started happening. can't figure out what happened and how to fix it
Please update your Lightroom to 2015.7/6.7 version and check if that helps. refer: Lightroom CC 2015.7 now available
If the above step didn't help, then calibrate your monitor profile to the default.
Refer the below links for the same.
Let us know if that helps.