Speed movement problem when resizing

I'm using this method to move an object

System EveryTick:

Set X to Object.X +2

The movement looks fluid, but the problem is that, when I resize the window(I'm using letterbox scale mode), the object moves faster.

Is there a way to avoid this? I noticed that using bullet behaviour runs equally faster when resized, but is there a way to implement this without using the bullet behavior?

search manual for delta time

Wow that's fantastic! :D

I just bought the standard version of Construct 2 to be able to publish to IOS/Android and use families.

But using dt i've found a new problem:

dl.dropbox.com/u/76175551/Problem.capx

The objects appear at minimal diferent distances and I can't use Wrap behaviour because it interferes with other things i'm planning to do.

What do you recommend to avoid those gaps

Instead of setting x to 960, set it to Ground.X + Ground.Width * 6.

Thanks! it resolved the problem :)