Something wrong on mesmer skills...

Hi all, i might lost something but the dev team changed something lately about mesmer skills ?
The point is that now i can't interrupt anymore a ranger...most of my skills are useless like no effect on rangers (pve)
Example usually I just interrupt with power spike skill a ranger that is casting troll unguent, but now my power spike has no effect on any ranger skills...
could anyone enlight me about this problem ?
it is a bug or what ?
thanks in advance

Power Spike - If target foe is casting a spell, the spell is interrupted and target foe takes 20...86 damage.

Troll Unguent - Type: Skill

You can't interrupt Unguent with PSpike, since PSpike interrupts spells only

Try Cry of Frustration or some other interrupt that interrupts skills as well.

i swear..till a week a go i was able to interrupt the troll unguent with power spike...