Quote Originally Posted by tophand View Post
Could be your server/host doesn't have GD support for png files turned on or have not installed that package.

Admin--> Version and scroll to the gd & zlib heading to see.
I have both gd & zlib support enabled but I get the message:

Warning: imagepng() [function.imagepng]: gd-png fatal libpng error: zlib error in...

What am I doing wrong?