The Sense verb has stopped working to determine the remaining duration of an illusion on a demon. Is it just me?

Sense was recently updated regarding log traps in the Landing. The announcement was here: http://forums.play.net/forums/GemStone%20IV/GemStone%20IV%20Announcements/Important%20Announcements/view/2127

I tried it with two different demons. Each gave the same result: "Probably not a good idea."

>look gnoll

It looks like your average fork-bearded gnoll.

Peering past the surface of the illusion you have created, you can make out the faint form of a perfect black essence rose suspended within the gnoll.

>point gnoll

You point at an old fork-bearded gnoll!

>sense gnoll

Probably not a good idea.

There were no other gnolls in the room and nothing in my inventory that would be confused with a gnoll.