Originally Posted by
Ambereldus
Your disappearing ice lance cast seems like it could be an issue with your lag tolerance. Basically, its a setting that tells Blizzard how long in advance to start detecting the next spell to queue. Never, ever, ever manually delay longer than your GCD. (An exception can be made for comet storm + ice nova, but thats another matter entirely)
Set it low, and queueing becomes practically impossible.
Set it too high...and not much happens honestly.
I posted a link in the frost mage sticky describing how to change your lag tolerance. Personally, I have mine set between 200-400 ms, even though I run with a steady 60ms latency. It makes spell queuing really easy, and helped a lot during the double-IL era.