Reporting Web Studio - blank page
We're running an 11.1.2.4 Hyperion environment, of which I'm not sure at this point what subversion it is, but I did patch the WebLogic Server with the October 2020 CPU patch ..
.. and it is being reported to me that the "Reporting Web Studio" no longer works.
When you lanch it, it opens another screen, with on top an URL that is displayed, but for the rest the page is blank. This remains also after a long wait - nothing is happening.
It does work on our unpatched, and Production environments, but not here.
What can be the issue ?