I just tested in IE9 and IE10 and wasn't able to recreate the error. We do have IE8 to test with, but it's on a different system that I won't be able to test with until later today. I did a search of Facebook bugs, and couldn't find any recently like what you mention and we haven't heard this from any other users. So, not sure whether it's your site or your computer, but we'll help how we can.
In the meantime, can you try the following:
* Try from a different computer with IE
* On the same computer, close IE. Then go to Start -> Accessories -> System Tools -> InternetExplorer (No Add Ons). Try again with IE in that 'clean' mode and see if the issue still happens.
Let us know your results.
Thanks,
Alex