Query editor window not appearing

Hello,

I have recently upgraded my pgAdmin install on Windows 10 Enterprise to pgAdmin 4 v9.1. Having done so, when opening, my connections work for listing tables etc, but query editor will not open as a functioning window. It is listed as a title with Query History, Data Output, Messages and Notifications, but no way to enter text, load a file successfully (no error, just does not populate a window). I tried removing pgAdmin in the user area (roaming data etc as this resolved a previous issue with pgAdmin), but no luck this time. Is there a known issue like this affecting others?

Regards,

Graeme