[@Caits] I think you might be right. 

The color you were using (At least in the CS) was fff200

But now it is just being typed in as Yellow. 
 
Lets compare the difference...

fff200 - [color=fff200]The quick brown fox jumped over the dog.[/color]

Yellow - [color=yellow]The quick brown fox jumped over the dog. [/color]


Well from the looks of it, fff200 is just the pure code on this forum for Yellow - so no, you are good. Must just be the resolution.