movement restriction

Hi, I am a beginner with MMF2.

I have created a pretty wide frame, and the display is scrolling +1 pixel "always".
My spaceship has an 8-directions movement and it isn't supposed to move outside the display.
When I set the event "spaceship leaves play area" -> "movement = stop", the restriction functions okay with the upper and lower edge of the display, but not the left and right edge. When I set the event "compare x/y value equal to left/right/top/bottom edge" -> "movement = stop" it still doesn't work! There has got to be a way for the spaceship to stop at the edges of the display. Please help!

The play area is the frame, not the display. You can get the coordinates of the visible area with X Left Frame, X Right Frame, Y Top Frame, Y Bottom Frame.