Unfortunately I can't help as I don't use chrome, but there have been problems with chrome 18.0.x as some are so recent a release the webrep can't keep up to remain compatible.
You don't say what your OS is, but since you have IE8 that I would assume is XP as IE9 is the latest version in/for Vista and win7. If you have either of those OSes, I would upgrade to IE9.
I use IE8 on my XP Pro system and whilst I generally don't use IE8, a quick test shows the webrep working.