There is a known problem which occurs occasionally with the ads. You'll know it is the ads if you load a thread and either:
(i) you see nothing for a period of time, say 30 seconds, and then suddenly the rest of the page appears, or
(ii) the top section of page loads, then pauses for a period of time then the rest of the page suddenly appears.
There are no other problems of which we are aware, but please do let us know if you see any. Remember that unless our monitoring system sees a problem then the most likely (not the only, but the most likely) explanation is a problem with your own Internet connection - even if you subsequently visit another site and it's all okay, because such problems are usually very short lived.
There were a couple of times this afternoon (Wednesday) when you would have been logged off and had to log back in, because we had to release some emergency fixes to the system. When we do this your session ends and you have to log back in.
Lastly, note that if you elect to use a script blocker of any kind then various parts of the site will not work properly.