Ah, I understand. The following is a possible explanation...

If you upgraded to Poser Pro, or Poser 7 SR3 recently, it handles file references differently to all older versions. (If you haven't upgraded yet, you can ignore the rest of this!) See this note from the SM support pages:-

Poser Pro and Poser 7.0.4 (the version you'll have after applying SR3) handle referenced files differently than earlier Poser versions. This doesn't change existing Poser installations, which can use the same Library structure they already have. In brief, Poser now writes 'relative' file paths whenever possible, i.e. the path to a given texture or OBJ file will be relative to the Runtime containing the file.

So if it's not saving the absolute paths for your texture files (which are not in any Runtime), then it still won't know where to look for them next time it wants to load them. I guess the answer would be to pop them into a Runtime/Textures/, and see if it works okay then.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)