So you are developing an Titanium app, and you've across this mysterious error. At least, that's what I'm assuming as you've come across this post. From what I can tell, it tends to be predominant on iPhone/iPod. I'm not sure if my solution relates to that, being that I'm developing for the desktop.
Incase anyone out there encountered this issue: Vindictus is running in windowed mode w/ no border, causing monitor tearing.
As noted by Mark Gibson in the .queue() docs, and the AjaxQueue tickets, the functionality of fn.queue changed and AjaxQueue is not working by default.