If you are using Internet Explorer, you should see a message at the top of every page saying that the site has not yet been tested in IE. The reality is that Internet Explorer has a lot of bugs, so it's difficult to make everything work properly. We will of course get there, and I plan on starting to fix things in IE tomorrow.
But sometimes IE bugs can take a while to sort out, so I strongly recommend using Google Chrome, Safari, or Firefox (and I recommend them in that order, fwiw).