I've got Flash Builder 4.6 on a Macbook Pro. I've enabled folding and all works well with the mouse. But the key binding doesn't work. I've tried several different combinations but it doesn't work. There are other key bindings that work fine. I don't know how to debug this. I used different options for the "when" field like 'Editing Text' 'Edit Flex Source' 'In ActionScript Mode' etc. but doesn't seem to make any difference pressing the key combination does not fold the code. Has anyone come across a similar problem or know how to solve please let me know.