[AUCTeX] preview-images much too high

[Bernd Schmitt]

Hello,

I am using 

auctex-version (from cvs) "2011-05-15", 
emacs (from cvs) "23.1.90.1 (x86_64-... of 2011-07-27", 
ghostscript 8.71,
dvips 5.98,
dvipng 1.13 (kpathsea 5.0.0, freetzpe 2.3.11, libft 2.4.2, t1lib 5.1.2)


if i do preview-region (or buffer) all images (formulas, ...) get a bounding-box
which is much too high (about sreen-high). i tried to fix this by customizing
with no luck. searching the web did not help either. 

what informations do i have to fetch to analyze the problem? how can i make
preview work properly again?


I would be glad if someone has a hint/url/info-page for me to solve the problem.


Bernd