Here's what happens:
I press "Check now" to initialize sync. It starts to go through the "Starting sync..." process, populating the list of albums to sync. At 75%, it stops and nothing new happens; it just stays at "Starting sync..." 75% indefinitely. Force quitting and restarting my phone lead to the exact same behavior (75% every time). I tried to remove the album that it had just put on the list from mobile and it still stops at 75% - just with the new album removed - despite force quits and restarts).
Completely wiping and reinstalling hasn't helped either.
This has happened sporadically in the past, but at least I had a library to listen to at that time. The phone was reset to factory today so I no longer have the library on here. I have even tried resetting it multiple times today. I'm on a limited data plan so streaming is strictly out of the question.
I have also submitted a log of this - please respond. I really would like to get my music working again, else I'm going to have to leave this great service.
Thanks for sending in the logs. I'll share these logs with our engineering team. While we may not have an immediate solution to the trouble you're running into, this will help us improve our apps for everyone.
Thanks for your patience,
Kevin Ebaugh | http://rd.io/people/kev