I only heard of 3D (for personal use) midway through Poser 6, but I believe there is a limit to texture dimensions in P5 which is less than that of P7 and later.  I wonder if that is the issue, but I don't know.

State the pixel dimensions of the textures which failed.  And hopefully, someone with P5 experience will jump in here.

~  Ooops  ~  Mark posted while I was still typing. ^^

What do you mean by sp2?  Stephanie Petite (generation 2), or does that refer to a service pack 2 (for P5 or for WinXP?)

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5