What kind of errors? Did you try an "on start of layout"? Try disabling conditions to make it work.

Try using it in a newly created file to see if it works there.

My 2 cents

I've made a quick example for you to study how I've done it.

I basicly did that when "on touch" your paddle will move in the direction of the area you are touching.

If you're touching the screen on the left side of the paddle, the paddle moves in a certain speed to the left.

If you're touching the screen on the right side of the paddle, the paddle moves in a certain speed to the right.

Hope you can figure it out with the help of this capx:

I honestly can't tell what you mean by jaggedy movement, so you're going to have to upload a capx or an example so people can see it for themselves.

You can check the angle of an object by using the conditions: "is between angles" , "is clockwise from" and "is within angle"

I think you're going to have to tell us more about what you're trying to do.

Maybe there are other ways of doing it.

Have you tried putting each card sprite + symbol in a different family?

More about families here:

https://www.scirra.com/manual/142/families

You can also try:

ViewportBottom(layer)

ViewportLeft(layer)

ViewportRight(layer)

ViewportTop(layer)

Return the viewport boundaries in layout co-ordinates of a given layer. Not all layers have the same viewport if they are parallaxed, scaled or rotated separately.

From the manual:

https://www.scirra.com/manual/126/system-expressions

"System > Every tick"

"Set healthbar x > "Player.x - 200"

"Set healthbar y > "Player.y - 200"

This will set your healthbar in the top left of your player at all times. (If the scrollto behavior stops because of a wall, the healthbar will continue to move with it. For this you will need to make extra conditions to the every tick to only make it happen when nessecary).

You would have to host it on your own website / hosting service to give permission to yourself probably.

There would be a lot of conditions on your enemy if you want to create a smart AI.

The more conditions you add, the "smarter" your AI becomes.

Of course if we could've made a human-like AI, we would already have robots cleaning our house for us.

It may be that the server you're loading the image from does not give you permission to load the image.

Check the error log(console) in your browser by pressing F12.

I've tried it for you and here's the result in a screenshot:

You can use an image editing software like photoshop to make it into smaller images and reconnect them using events.