but I cannot click any buttons (Allow/Deny) with my arror/mouse. I'm using Google Chrome, Windows 7, 64-bit, and the latest version of Flash.
I think the problem may be because I have increased the font/display size on my computer to 150%, but this is necessary to have.
I have unistalled Google Chrome and reinstalled it, but it has not fixed the problem.
I believe you are correct. I seem to recall a bug regarding the font dpi size on Windows being in our bug database. While we work to get this fixed, you should be able to work around this using other methods. Please see this FAQ (which refers to Mac, but is also applicable on Windows).