Current Frame Animation Meter

Hi,

trying to animate through some png pictures.

The animation meter is running and i can access all parameters except the current frame.

The images are shown correctly with this string:

MoonShadow-%g.png

i.e. 0-1-2 when the Meter selector is set to "Position" but when i set it to "Get Current Frame"

i get no result in the %g variable.

How to access the current frame number of a running animation meter??

Please help.