It seems that the upload manager isn't working correctly, because when I try to add files to my post, it fails to upload them, even after multiple tries.

This just started happening today, but in general the manager isn't entirely reliable for me. I've found that very often, my uploads will not take, although I usually get them to work by trying again - today that is not the case, and I can't get any of them to post, at all. Anyone else having this problem?