Sage 300 2019 web screens don't open now in CRM 2019

Sage 300 2019 is integrated with Sage CRM 2019 R1.  After install the Sage 300 web screens opened and worked in Sage CRM.  They stopped working.  No error message.  The dots on the screen just keep marching along.  The Sage 300 web screens work okay inside of Sage 300.  Web proxy is installed too.

What would stop it from working?

Any and all advice appreciated.

Dana