I know this is the penultimate newbie response, but...

"That's what I'm doing."

Let's say I've got a Yari Ashigaru unit in a province with a castle and spear dojo. He's been there for several turns, being the garisson after conquering. 10 men left. I open the Training dialogue, works fine. But I can't select anything on the map in order to get their little square boxes on the bottom (the ones you drag to merge). I can click on a unit all day, click on every part of him, but it won't select as long as the Training dialogue is open. Likewise, if I select him first, opening the Training dialogue de-selects him. I've tried this with a vanilla S:WE install and with v.1.12.

Maybe it's something they "fixed" in the S:WE pack (as opposed to an original S:TW which was upgraded to WE later?)?

Will do screenshots tomorrow if that's not the case.