When the Ulduar patch went live a new bug started happening with mages blink ability, when doing rapid facing changes followed by a blink you will sometimes blink in the direction that you were facing previously, it seems to happen more often after completing a cast. (eg. use your mouse to immediately change your facing after completing a cast and cast blink, sometimes you will travel the direction you used to be facing)
It almost feels like character facing on the server is not updating quick enough.
Have had this happen numerous times on my mage since the ulduar patch has gone live and have recently heard from Fusion that there mages have also experienced this bug.