Hi,
yes, I will try to find an alternative for open: true; and get back to you
UPDATE: I found what cause this.
This is problem with template. If I change template to protostar example, everything worked well (images are shown and open window worked), but with your template shaper_helix3 not.
I am not sure why this happend, but template hide modal window and sets an absolute position.
Please check this solution:
crosstec.org/en/forums/37-contentbuilder....html?start=6#129071
Regards,
Tihana