Q u o t e: We have collected a lot of feedback regarding issues in 1.10 and one of them has been concerns with the functionality of vanish. Through our testing we have not yet been able to reproduce an instance where an incoming attack would break stealth.
Q u o t e: Apparantly Arcane Missile channeling is not canceled by vanish...
Arcane Missile breaking stealth specifically is a known issue.
I never stated that I don't believe those posting issues with vanish, I believe that some users are experiencing legitimate issues. From the testing done thus far we have been unable to faithfully reproduce the issue. My own personal experiences while playing my rogue unfortunately can't factor in to a reproducable issue. There has been a lot of great feedback in the thread you linked to, and I will compile the information given and will be sending it off for further testing.