I have not investigated this, but campaign maps are the only maps that ship with images as extra data (the portraits of the speeking characters). Likely the loading code there is not valid for libpng 1.5. Also, the writing code (when savegames are written) will not be working anymore and need to be investigated further.
I have not investigated this, but campaign maps are the only maps that ship with images as extra data (the portraits of the speeking characters). Likely the loading code there is not valid for libpng 1.5. Also, the writing code (when savegames are written) will not be working anymore and need to be investigated further.