Potential Power Block Issue

So, I was playing around with my Mesmer yesterday, using one of my favourite skills, Power Block. I love that even now since they've decreased the recharge. Anyhoo...I used it to interrupt Rotting Flesh being cast by a Skale Blighter in the Marga Coast...it started casting it again straight away! I thought the skill was supposed to disable all the skills of that attirbute for 16 seconds (with 16 in Domination):

[skill=big]Power Block[/skill]

So...I tried this elsewhere...I did Hell's Precipice mission and again...I would interrupt Rodgort's Invocation only to find that they would start casting another fire skill straight after. This seems to work as intended in Fort Aspenwood vs other humans, however, as I can use it to easily shut down a Searing Flames ele - they stop casting fire skills so I assume it's working there.

Is anyone else having / noticed this or is there something I'm missing?

Never happened to me, but I've not used my mesmer last week.

It could probably a bug from last week end update, if it's this way it should soon be fixed.

I would repost this in the GW Weekend forum. They also want to know about any bugs that have popped up.

It happened to me as well. I hope they picked up on it.

I end up using P-Block whenever my mesmer ends up in Hell's, and it has always worked fine for me. But that was at least a month ago now, is this a recent bug?

Power block is my best friend against bosses, but I did not notice this bug.