Mine does that sometimes too. I just wait and go back later and it usually works!
Hey Girl - this happens to me a lot at work, but not at home. In fact, i was at work when i first read your post & started to comment but then quickly remembered i have the same problem! So annoying. I will say that the only difference between my work & home computer is at home i use Firefox & at work I use Internet Explorer. I used to use explorer at home but i was having some blogger issues that a friend was not having & she told me she used Firefox. I switched & never had any problems again. I hope this helps!