Same problem, but apparently they can't tell when the device is / is not connected - I have the app set to only use WiFi - because I don't have a cell phone plan (yes, that's right, I have a phone, but no cellular provider) - and I only turn WiFi on when needed, because it's a battery hog (and I rarely need it), and even in this condition, the app hangs. I've just uninstalled the app, power cycled the device, and reinstalled the app. Now I'm trying to re-download all the content, and it crashed in the middle of that. It will not sync my notes - perhaps it's waiting for all the content to download, or maybe it's just the sync function that's broken. :sigh: two versions ago, it worked...
Anywho, I'm now about to try airplane mode - absurd if this makes the device work - they can't gracefully handle a failure to connect to the internet? (Of course, they never could - the error messages from undownloaded content stayed on screen for several minutes as if I couldn't read the message in 10 seconds....) OK, got a hang while WiFi was connected. Now in airplane mode.... Opened to D&C 88 and scrolled around some. Now waiting... Still working after 3 minutes... And still working after 12 minutes - thank you for the airplane mode tip! At least I can once again use my device for reading. Hopefully they fix sync soon so I can make use of annotations again...
PS: Someone needs to tell the development team to handle failures to connect the same way they handle airplane mode - downloaded content works, undownloaded content doesn't - simple, but apparently they can't figure out that not all of us area always connected without fail...