BUG #16713: Can't load server

The following bug has been logged on the website:

Bug reference:      16713
Logged by:          Simon Rathbone
Email address:      s.rathbone@therathbones.com
PostgreSQL version: 11.9
Operating system:   Azure Hosted (so the version is 11.x)
Description:

After upgrading to pgadmin4-4.28-x64 the website would no longer load.  It
just got the the wait screen with the swirling logo and never moved
forward.

I uninstalled then reinstalled 4.27 x64 and now it doesn't load at all.

Not sure what to do now so I will just reinstall the latest version and hope
for the best.