Got it - one of the extensions I had installed for checking my calendar either upgraded or got corrupted and appears to have been causing the redirect loop. This doesn't explain why it was doing the same thing in Firefox and MS Edge, but it's working in Chrome, which is really all I cared about.
Here's how I fixed it:
1] Created test user in Chrome to see if my actual profile was corrupt and opened a new window using the test profile.
2] Loaded the forum and everything worked fine.
3] Installed the extension under the test profile.
4] Went to the forum and logged in - couldn't log in, just kept taking me back to the main page as guest and never showed the login screen.
5] Turned off the extension - same thing as #4 above.
6] Uninstalled the extension and everything worked fine.
7] Went back to my actual profile and uninstalled the extension and everything seems to be working fine now - sending this reply via my actual profile.
I'll keep an eye on it to see what happens going forward.
Thanks for the help everyone!
Lou
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