Yeah. I'm doin something where I have a sub-application popping up when pressing a certain key. The problem is that the sub-application object does not want to scroll along with the playfield, it keeps following the player that the screen is centered on. I want it to always stick to the upper left corner in the visible playarea. I've tried the many ways I know of and I wonder if there's anyone knowing what the problem might be.
You might want to have those actions in an "Always" event, rather than in "Xpos <> X left Frame". And try to have it in the same event as the event when the camera is centred. That way as soon as the camera is moved, so is the subapp so it stays in sync. If using the method Phizzy mentioned there it'd work but it'd appear to judder a little when scrolling. The same can happen if using a different event to that where the camera is moved.