I've recently installed your plugin. It's been great so far, Personally I haven't noticed any problems. I have it set to display when users are using IE 8 and down, all other browsers disabled(set to 1). Yesterday a user of my page told me that they saw the ribbon while using the latest version of firefox. I have it disabled for firefox.
So I thought that it might have something to do with cache and after I cleared my cache, they said that it was gone.
I haven't been able to replicate the problem anywhere, and I've been using adobes browserlab to see how it looks on other browsers and everything seems to be working okay.
So I'm wondering if this was something to worry about and possible cache conflict or if this was just a one-off case and I should just forget about it?
Sorry about the long post, and the page in question is http://www.foodchinese.com.