Two things have been happening for me:
I've been getting some random coding just above the banner when I use Advanced Search. It almost looks like broken scripting as it's fragmented and not an intentional message So far, it's only happened 3 or 4 times at random and I didn't think to catch e screenshot until now. If it happens again, I'll grab a screenshot and post it here.
And the other thing: blank pages. I mean, like "click on the thread link and go to the page, but it's blank" kind of blank. I refresh the page and voila! it's loaded as it should be. This has happened both on Firefox and OSX and also occurs at random.
And a special mention: I have noticed that older posts are not always displaying images uploaded to the server. I am not talking about photos attached from photobucket or imageshack, etc. but ones uploaded to the server. This too, is random and just to be sure it wasn't a loading issue, I refresh the page and still nothing.
And by the way, there is a very simple way to upload multiple images into a single "upload" window...I do it all the time in "Quick Reply" mode.