Installed 5.3.7 - could not connect to updated SH server

I installed 5.3.7 on Windows Server so I can help M1 Mac users. I had to revert to 5.2.9 which works fine (of course except on M1 Macs). Any advice on what I need to do to get 5.3.7 working would be appreciated.

,SH_Issue_01

Thanks,