Meanwhile I've found a workarround with the internal funktion.
The lat/long bug semms to be solved!
First I've enabled the P9 camera funktion.
When I start the camera the first time, a screen appears, where I am asked, where to store the images. It doesn't matter what I choose, but the 'don't show this message again' should not be marked.
When I now choose the GPS Exif mode, it works.
When I start the camera a second time, it wont work, if the screen where to store the images doesn't appear. So I have to choose the internal memory in the upper task bar. Closing the canmera and starting again, the desired sceen appears again, and the GPS funktion is working.
I've tested it with the O2Ger WM6