The "Forum" link on top of the main site has been appearing and disappearing for me in Chrome. I assumed it was related to the update to the new forums, not a browser incompatibility..
It actually began disappearing for me a couple days before the migration to the new forums. The last couple days before the switchover, I had to manually type in
https://tomshardware.com/forum to get to the forums. Then it reappeared, then the switch to the new forums. Since then it's disappeared and reappeared at least 3 times for me, though it's been stable and present this entire week. All this is in Chrome (in incognito mode with uBlock Origin).