IWT broken?

[tldr]

PEBCAK edit:

Google turned up a thread from about a year ago of someone (Mickthathick) who had the same problem, and it was because click-to-move had been disabled. Which I turned off on my 2nd (tanking) account to play my old warlock from pre-multiboxing. I was oblivious to the effect CTM had on IWT. (I assumed this was some new thing from a recent patch and didn't search beyond recent postings here to begin with).

In short, turn on click-to-move on slaves if you want interact with target to work