When I open an image, I always get: 'Floating point division by zero'
IThis error occurs when you try to open a file image using 'Open' menu option or toolbar botton. This option is reserved to open only posteriza definition files (those ending in .posteriza), It's not intended to open image files like  .jpeg, .bmp, etc.

In order to avoid this error, always use the button 'Open Image' you'll find in tab '2.Photo' to insert a file image.