From my laptop, there is a message at the top of the forum page that says my browser is unsupported. I have the latest version of Firefox, but I am unable to compose a post or reply to any posts. I can only do it on my phone. It would be great to see this fixed.
Weird, I am just now using the latest version of Firefox on Linux to read topics and reply. What operating system are you using? Check browser extensions, try disabling them. Also check any running antivirus software… Will try to update forum now, maybe it gets better.