screen coordinations problem with Galaxy Tab 7.0.5

[Havanna]

My App retrieves the width and height of this stack in the preopenstack function and places them into a global array.
All coordinates and sizes then are calculated on these values as needed.
Labels and Buttons are sized depending on formattedwidth and and formattedheight.
That used to work aut all right (android and IOS) and many different display formats.

No I get reports and screenshots from Galaxy Tab that show some coordinates to be wrong.
Also in some buttons the text gets cropped.

Any idea how this might happen?