I recently had an issue with the color of visited links when using Cufon. More specifically, I am using the WP-Cufon plugin with WordPress.
The issue I had was that the color I set for the link wasn’t being rendered by Cufon. In firebug it showed that the element color was red, but it was showing as the yellow color I had set as the universal link color.
After fiddling about with this for *ages*, I found the fix. I had checked the ‘Delay-Fix’ box in the plug-in; as soon as I un-checked this box the problem was resolved. I now get a small flicker before the Cufon is rendered, but it’s a small price to pay for being able to select the link color!
I hope that this saves someone some time!