There is an issue with the update mechanism in 3.3, 3.3.1, and 3.3.2. (An incompatibility with Sparkle and Xcode 6.1)
You will need to update to v3.3.3 manually.
sorry for any inconvenience.
this update bug only affects users of v3.3.1 and 3.3.2.
you can grab the update form here: