Ryan,
What I am hearing is, at login you see this:
Then you select your map (any map) and then it is followed by the map starting to load but then it spins and never really finishes loading. If so the factory reset would be the only answer that I know of that has worked. If your maps are doing something different there are a few possible answers we can explore.
At any point does collector:
1). Open a window that says "Unfortunately collector has stopped" and then,
2). Crashes and then automatically reboots up again but,
3). The map that you tried to open is no longer on the maps page but,
4). if you refresh Collector the map reappears?
If so, at what point during the loading does that window appear?