ad 1)
The output of combined vectorial objects (like "B", "O" etc.) seems to be somewhat buggy in the WMF export. The vector path directions are identical, thus the importing program does not recognize the inner vector path as a "whole" in the other object.
ad 2)
Please check whether your vector object has an outline definition other than TRANSPARENT 0.0 mm.
Grüße / Greetings / Groetjes / Salutations,
Ulf Dunkel