I have updated my Android Studio to the newest version, but now when I call the auto-completion/suggestions with CTRL+SPACE the suggestion box opens bu
I'm using Android Studio 0.8.1 on OSX and have been experiencing the same irritating behavior.
The answer by @daniel-gabriel was not was I was looking for.
A better solution seems to be to go to Preferences > IDE Settings section > Editor > Code Completion
(in AS 1.2.2 located in Preferences->Editor->General
) and unticking the option Autopopup documentation in (ms):