Hi Wolfgang,

thank you for the patch. - It works again without error.

Still there is a small point to be made and corrected.

When in the attached example the grid is set to 3 x 3 (the actual size of the chart) the right most comment is clipped to the first letter, Only if the grid is set to 3x4 then the comment is completely visible.
Furthermore there is a clipping problem with the topmost comment. This text is clipped along the arrow-line and this can not be corrected by setting the grid to 4x4.

Kind regards 
Willi