9.55 does not display PNGs

Hello

It seems that Amaya does not want to display PNG images any more. I 
guess in 9.54 it worked. Does anyone else have this problem?
I am running on Debian etch amd64 and using wxWidgets. The version of 
the libpng library is 1.2.15~beta5-1.
Other image formats (jpg, gif, svg) are shown as expected.