Thanks, Bob. I tried both resetting the preferences, and uninstalling/reinstalling ID 2015. I still get either an "Exporting..." message, or just a pinwheel.

All you need is an Adobe ID, and you have a free trial to the best platform there is. And - get a new ID and you can carry it on. Its a trial, so one couldn't publish anything to devices in the main, aside from trial apps and the Preflight app. So its a great option - you just have to start again each period...Otherwise DPS Classic (Suite) is still running.Nothing else compares though or even comes close, as a code-free environment right now that's easy to pick up in a matter of days.