Vehicle Exit Button
 

From the list of known bugs you probably already know about this one Scot, but as I didn't see a mention of the particular quest, it's "Circle the Wagons... Er, Boats" at Fizzle and Pozzik's Speedbarge in Thousand Needles (what used to be Shimmering Flats). I had no exit button, and ended up disabling nUI6 to get out of the boat.

Edit: I did discover that, for this boat at least, if you find a place you can run it aground, you'll be automatically ejected, so no need to disable nUI6 to get off the boat.

Just to be clear, we are talking specifically about nUI6 and not nUI5, correct?

Yes, nUI6. BTW, after completing this quest, you get to keep the boat.

similar button issue in nui6
 

scott sorry this is in nui+
went back to the argent crusade to finish out the rep dailies, once equipped a lance and mounted any of the mounts i lost control of all functions through mouse click for shield attack charge throw and duel the only one that would click was the restore button. and about half the time the keyboard numbers wouldnt work either

thanks for your time and talent sir

nUI+ 5 or 6? I use 6 and have been doing the tournament dailies on my priest for a few days now and have had no problems at all doing the mounted combat.

Yeah... I've had not problem with those quests on 5 or 6. Not sure what's going on here.

The only thing I can think of is something causing taint maybe?