Yea I have. Tried clearing the cache of my entire phone nothing happened. Also my phone doesn't have much apps so it wasn't the apps interefering. Tho the timer on the notification bar is shown, nothing more.
I have same problem, on one of my accounts i cant login just same thing loading starting and then nothing happens, but when i use another it works well.

PS: it seems to not work on newly created accounts from some reason.