Lightroom tethering question

[Westjphoto]

I have a Canon 5DSR. I am using a tether tools cable connected to a MacBook pro. I want to use live view for classroom instruction and also capture through lightroom. I just get a spinning wait cursor when tethering. I know the cable works because I contacted tether tools and downloaded their software and it worked fine. So it has to be a lightroom issue. Any clue what might be wrong? I have used this camera before with lightroom with no problems. 

[GoldingD]

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.