I have same problem for about 2 weeks now on Polish server, so I think it affect all language version.

- Is it affecting only specific ninjas?

No.

- Is it affecting all special skills?

Yes.

- When are you experiencing such problems?

When I try to use Mystery during 4th enemy ninja standard attack, so I can CC him for next round, nothing happen, even if something attack after this 4th ninja (clones for example) and skill start to "cast" at begining of next round.

- Is it happening during specific in-game timed event or is it random?

All PvP 1vs1 content for 1.0.

- Is it placebo?

No, I get nervous because of this for over week now, and now someone send me link to this thread.