The workaround Steve posted works fine for me. You get exactly the same browser interface, it just doesn’t appear to actually open in a browser, but it works.
It did take me a couple of tries before it would open. No idea why, but if you’re getting nowhere give it another go.
Thanks for the reply ChrisSU. I think it’s my flipping age, as I have not made myself clear. It works with OS Catalina, but with OS Monterey, I get a white blank screen! I suspect a update within the OS system has knackered it, or it never worked with it. So if anyone has OS Monterey, does it work for them please?