Crap. Based on the first post, I kinda got the feeling it was there at some point before I jumped on.
Basically I was trying to book this double open jaw thing I saw on SF. SFO-BKK return KUL-YVR. As much as flying UA vs NH is punishment, I wanted the miles, so I was trying to get SFO-HND direct on UA, or better still SFO-KIX thinking the flight might be kinda dead, then taking 6 hours to explore KIX, getting back on at ITM to check out a new airport. Wanted to try and force AC from SFO-YVR on the way back as well to get some added miles.
Well, long story short, all the itineraries were either unbookable, or unretrievable. Tried using faregeeks which couldn't understand that SFO-YVR would be on the same day as NRT-SFO and earlier in the day. Even the simplest SFO-NRT HND-BKK, KUL-HND-YVR wasn't bookable at the price ITA was showing. The priceline link never once worked for me even on the easiest routing.
I've used ITA to great success, including booking SFO-PTY-MDE (all on CM) via the AC website to be able to use an AC credit I had kicking around. Then some other messed up itineraries. But this one I just couldn't get done. Oh well. What can you do.