Hi there
I’ve startet using babylon only for a few hours and I’ve walked into a problem with some GUI elements.
I have a textBlock which has a height of 40% of the parent ractangle. both of them are combined in a other rectangle and there is also a image with the height of 60%. if the parent rectangle is declared with size: 18 (so a 1:1) the text is not disorted… does anyone know, why this is happening?
With 1:1 (size: 18)
With width: 18, height: 14
Thank you for showing me some clarity 
Hello and welcome !
Best is to provide a Playground to reproduce the issue
I don’t know how you have set up your image and text within the rectangle, but indeed, changing the parent size should not affect the text distortion.
Playground
++
Tricotou
I also noticed that the texture resolution ratio must coincide with the mesh aspect ratio, otherwise the texture is distorted
Let me add @RaananW our Gui expert
That looks like whats happening! How could I solve that with Code? Not sure what you mean by texture resolution ratio 
For example, your mesh is 10x20 in size, then the texture resolution should correspond to the aspect ratio - 512x1024 or 64x128, etc.
Would be really great to see a reproduction, including the construction of the advanced dynamic texture
Hard to say what the problem is without that