When adding the annotation to a A4 page in regular portrait orientation I don't have any rotation issues.
When I call page.AddAnnotBitmap or page.AddAnnotInk on the same page I don't have any rotation issues. In all cases I use vpage.CreateInvertMatrix and mat.TransformRect or mat.TransformInk to calculate the position.
It seems that the library deals differently with text annotations. Could you please point me in the right direction?
I am pretty stuck here.