Getting the flot-rails gem to play nicely with IE8
How to go about getting this Gem working nicely with IE8
An issue I found recently that was to allow flot to play nicely with IE8 you should have excanvas.js present, this essentially gives canvas support to older versions of Internet Explorer (which is something that flot relies on).
The fix then, if you are using rails-flot along with a need to support Internet Explorer 8 is to include the following in your manifest file;
//= require excanvas.js
Before you require anything relating to flot.