It looks like there's a CSS issue as the actual bar is not showing up and you have to find it by clicking where you think it will be. I will have a look at the template CSS and try and get this fixed.
Until that time you can use your mouse wheel if you have one.
It works fine on IE now. Guess it's a chrome only problem.
Theory: There's also a scroll bar for the quick reply, and that might be purposefully black, maybe that's transferring over to the page on chrome?
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