reply to thread issue

I have some issues posting replies. Not sure where the problem lies, but sometimes when I reply to a thread I can't type the messahge. Main body message box stays the barker shade of grey that's present when the page is loading, there's no cursor and you can't get it to appear. Refresh doesn't help, sometimes going back and clicking through the link again does. Othertimes I have to use quick reply.

This happens across forums, and on both my work and home PCs (less frequently at home). I'm using the current build of firefox, with a number of plug ins but nothing out of the ordinary.

Anyone else get a similar issue, or is it just me?