I just noticed this today. I monitor a number of sites and servers using the great Xymon system monitoring tool (Linky). It is based on early Big Brother code. Anyway, today I noticed that the graphs were all blue. Something like this:
I’m using Xymon 4.2.3 on the servers, and both servers show the graph like this using Firefox 3.5 on Linux. Google Chrome development version, SeaMonkey 1.1.5, Epiphany and Galeon all display the graph correctly.
I have no solution, but I thought I’d post my experience.