Whole app useless- stuck Syncing Photos, "Unable to connect to network", can't open any other albums
I imported a card's worth of photos and videos last night (1300) and left Lightroom to sync overnight. Since I woke up, only a handful of photos ever made it to the cloud (visible on lightroom.adobe.com and on iOS) and the rest still say they are syncing. Lightroom just says "Syncing photos" without displaying a number, and the cloud storage quota bar is blank and says "Unable to connect to network". Right after launching Lightroom, the syncing number shows 1135 for a minute or two then reverts to "Syncing photos". If you click on any album other than the one that was open when you open Lightroom, you get the blue spinning graphic that shows up when Lightroom is thinking really hard, and the album never changes. So basically the entire app is completely useless. The edit controls are even greyed out in the one album I can access. I hope I only need to edit on my phone from now on and also not import or sync anything.
I have verified in many ways including this forum post that I'm connected to the internet and I've tried on two different networks in completely different buildings. I've uninstalled and reinstalled Lightroom twice, once keeping preferences and once clearing them (though it seemed to remember the preferences even though I chose the option to remove them). I tried deleting the photos I'd imported in both Lightroom CC and Lightroom.adobe.com (where they appeared as Sync Issues) and that also had no effect. This is Lightroom v3.0 build 20191017-0835-b386176 according to the About screen, on a Macbook Pro 2015 running macOS Mojave.
