Rider 2019.2 downloaded and updated via toolbox, I went to open a small project I had opened and built the other day when I noticed that Rider had updated. When the IDE loaded, I thought it was taking an awful long time. I let it sit for 30 minutes but it just sits there saying "Syncing projects..." at the bottom and spinning. The project explorer just has the project name and "loading..." next to it, and for the projects immediate child. I completely disabled syncing, both in the setting in the bottom corner as well as disabling the sync plugin, but each time I close and reopen it does the same thing just sitting there syncing and running my CPU the whole time.
I reinstalled 2019.1.3 and opened the same project in that and it was fine. So for the time being 2019.2 seems unusable for me, unfortunately.