This is mainly the reason I can not upgrade to PhpStorm 2.
I'm on Mac OS X 10.6.7.
I search here for this problem, I not found anything similar. Perhaps I used the wrong words...
With PhpStorm 1, no problem. With PhpStorm 2, when I begin to write the first letters of a php function name or other (ex: "preg", the autocompletion popup appears. After, I can not use my keyboard to scroll down in the list, and I can not press Enter to close the popup. I can only press the Escape key, or use my mouse to choose my word. So if I really want to use this version, I have to write my functions rapidly, or disable autocompletion... I do not want to do that.
A clue? I noticed when the popup is visible, the main window loses the focus.