Last night we discovered that the water leak has been continuous. What we thought was a leak that happened only when the shower was turned on was really a constant leak from an elbow joint. We figured this out when the towel we put down over the carpet-tack strip to protect the kitties from walking on it was soaked after a few hours.
While I was at work, enjoying the last day of school with my students, the Plumber Fairy came and did magic. Look!
This is the wall in our hallway, partially torn out, to locate the source of the leak.

This is the wet, creaky, weakened subfloor.

This is the closet directly under the hallway, which held all of our coats, luggage, and my guitar.

Another hole was cut in our bedroom closet and more will be cut in our kitchen ceiling.
Isn't this fun? I'm optimistic that this will all be fixed soon. Hopefully this is the last of the major problems we will encounter and we can put this entire boring drama behind us!