Some observations:

Once launched, it worked very well. Has A LOT more options than the old script. (Which can be a bit cunfusing, though)

"Justify" doesn't seem to work, though. (Aligning through x-axis)

I have to look into it, though.

I had to click it, twice, as the first click messed up the OpenGL preview.

Seems to be a general Poser 13 problem, that "doing stuff" in the material room can easily mess up the OpenGL preview.

These were also the only occurences when Poser 13 crashed on me to desktop.

So far I only used it with Firefly materials. Can't say if there are any problems with Superfly.

All in all, thanks again to all who tried to help.