1. Won't correctly upload photos when making a new post.
2. Bold, Italic, Etc. do not work on the Advanced Editor.
I have tested all these issues on IE9, Chrome, Firefox. All appears to work except IE9.
I will keep looking at the issues, but in the mean time, my recommendation would be Google Chrome or Firefox. I would not personally use Internet Explorer 9 anyway.
~Eddie
See uploaded photo below (via Firefox):
