Any major browser should work fine with our service, but since the IE9 on your particular computer seems to be misbehaving for some weird reason, I just thought I'd suggest alternatives as a workaround for you.
Personally speaking, I really like Google Chrome and use that for all my personal browsing; it's fast, responsive, stable, and auto-updates itself, though it can demand a lot of memory if you like to keep many tabs open at once (it treats every tab as technically a separate program, so one misbehaving tab can't crash the whole browser, but this approach uses more memory).
Firefox is a very close second, and I actually use that more for work because I use it with some add-on extensions I like that aren't available or don't work as nicely for Chrome.
