I've seen this a number of times, only when trying to start a new thread (in the MP) - very annoying.
IE11, no plugins, at work but.... I don't recall having this issue at home but I don't post loads, let me try It's still happening and making posting unpleasant
Is it happening at work and at home? I'll have a quick look and see if there's anything i can do. If not I'll speak to a colleague about it. If anyone else if having the issue post below.
Yup I'm out today on wifi and just got the same. Also using a MacBook with Safari, if that has anything to do with it.