1 pointIt's because they changed the minimum width and height to 6x4. Deleting those lines probably cause their default to be used but you could leave them in and change the sizes accordingly.
1 pointI did apply to the Phoenix Club yesterday before I posted here, I just haven't received a response yet. I do appreciate the work that has been done to update osCommerce. Still, restricting simple upgrade instructions to those 700 members seems counterintuitive to growing the osCommerce/Phoenix community imho.