Is something wrong with WhatsApp today?

[anon(8316725)]

WhatsApp suddenly stopped working on my phone (1520) today. The live tile became shaded and stopped working. I do not know if this a phone/OS problem or WhatApp's?

 

[Wp_Shashwat]

It's backing up probably..

 

[anon(8316725)]

It's been hours!!

 

[Amit Mishra3]

It has happened twice with me... Reinstalling is only solution... Uninstall and install again...