There seems to be a small redraw problem when chosing "Show Line Numbers" and "Hide Gutter" as option. The space which usually is representing the gutter won't be redrawn when switching from one window to another (no matter if switching between php files and help within phpEd or between phpEd and and other running applications).
Here is a screenshot to demonstrate the problem:
Using build 4033eval
EDIT: After some more investagion it seems this problem only appears with scripts that do not completely fill up the code window's height.