I have a first generation iPad, with OS 5.1.1, and sometimes look at MathOverflow on it, in the Safari web browser. Recently, it seems as though posting comments has stopped working. I type the comment into the text box OK, but then the "Add Comment" button is completely unresponsive. Otherwise MO still seems to work fine.
Does anybody know what's up? Or has anybody else suffered the same problem?
Probably it's not just MO, but math.SE is the only other site where I ever post comments, and I don't recall trying to do it there on my iPad recently.