Thanks for the reply Doc. I've answered the questions below. Things seem to be OK at the moment as I haven't seen this since I made the OP. I'll just put it down to as "one of those things". It may have been the case that the post I was replying to was being edited at the time. Cheers.
Which browser are you using?
Have you tried another browser?
Are you logged in to the forum?
Are you using any ad blocking software/apps?
No, but ad servers are blocked to the point where I hardly get any ads.