As of at least beta 1211 (previous to current beta), when somebody else does a /me action in a channel, their action text is not colorized (ie purple), but is the same color as normal text (ie black).
When you do an action text yourself, it shows up as purple. Action text in queries show up as purple. The bug seems to only apply to other people's actions in channels.
Well. At least I won lunch.
Good philosophy, see good in bad, I like!