I'm trying to create a new format for a 3D PDF and it won't let me save it. I keep getting "Parameter is not valid". Am I missing something? Is there something I should be doing other than Save-As?

And I'm not sure what this box is telling me, if I can't open in a alternate location why is that the only option?

Also I can't even save the the standard one as a different name.

Thanks in advance for the help....

Aaron