It was changed yesterday:
To alleviate the "everything's orange" problem, if one of your interesting/frequented/ignored tags is in the list of tags on a
/questions/tagged/{tags}page highlighting for that tag will be disabled.
For instance, if your interesting tags are
javaandandroid, going to Questions Tagged java will cause onlyandroidtagged questions to be highlighted.
This code will go out with our next build.
