Originally from http://phrogram.com/forums/permalink/6935/6935/ShowThread.aspx#6935 

Chris.Robbins:

In terms of a TODO list I'd like to add full support for "geometry coordinates" rather than screen coordinates as these can cause confusion for educational applications. I tried an example using the SetAlgebracoordinates() command with the result that sprites didn't show! Having to use statements such as "Sprite1.MoveTo(x,ScreenHeight-y)" makes things a little less obvious to the novice and student trying to approach a physical problem.

Are you looking for a new feature or saying that this didn't work - do you have a repro case - you can ttach the .kpl file to your reply in the options tab.

I know we have plenty of samples using ther algebraic coordinates for drawing but you know I'm not 100% sure if they affect the sprite library.

Looks like a bug!

Algebraic coordinates don't affect sprites - they always live in the 0,0 top left origin space. However it should still draw. I noticed that if you resize the window the sprite appears.

Right now I can't find a workaround either..

I've logged this in the bug system... if you can let us know your plans for mixing sprites and 2d algebraic coordinates it will help us prioritise things.