I was debugging a cloud service and was using azure storage and compute emulator. Suddenly I noticed I began receiving SEHException when accessing a cloud table, and the emulator icon is not there anymore in the notification area.
I remember I checked don't show this window again sort of option, so that the annoying window of loading the emulator is not displayed.
I restarted my computer and ran VS2013 as admin with no luck.
I followed this article: http://msdn.microsoft.com/en-us/library/azure/hh403989.aspx
You just need to go to start -> search: Windows Azure Storage Emulator
This will run the storage emulator only, but you can run the compute emulator through the notification area icon which displays when you start the storage emulator.
Edit:
The above mentioned solution did not actually solve my problem, I found later that I have to set the cloud service as the startup project, not the web role.
Edit 2:
It can be also because of running a BitTorrent client. windows azure development storage blob service not starting