Some update from adblockers is interfering with the standard layout of the site, which is causing all the errors. We got tech working on a fix, but got a couple work arounds for now.
First, if you can disable your adblocker for the site, that's the easiest approach. If the site then loads super slow, I'd like to try and fix that for you. Ads on the site shouldn't be impacting your time here in any meaningful way.
Second, you can try switching to the "Classic" forum skin, using the drop menu in the bottom left of the page. The Classic skin seems to be working fine with adblockers on