I think when Audiogon got sold and the site got rebuilt with a bunch of features, there were a lot of glitches. There are always a few that pop up. I think a lot of the fora used to use vBulletin software, but I don't think that's a constant any more. Audiogon is, I believe, a custom built platform, so some of the quirks are not as easy to solve.
There are quite a few audio fora in the English language and any number in other languages if you are equipped to read or rely on kludgey translation software. Each has its own culture.
Audiogon has been around for a long while and is pretty comprehensive. Not easy to post pics or as "pretty" as some of the others on the 'chat sections' but it is pretty good. I doubt the powers that be would want me linking to what they regard as their competition, but they are pretty easy to find if you poke around the Web. I've remained here since I started posting in around 2006, with a few breaks for sanity or other diversions.
I hang at Hoffman not so much for gear talk but for music, pressings, and contribute where I can. I've actually reduced my participation in various fora over the years; partly due to the amount of time I can spend in one field and partly due to other interests.