I am importing a character from poser to blender, and after I get there, and rendering is working fine...I save it as a .blend file, and then all renders go pink (i.e. the object is pink for all textures)

I've been googling, and...

1. some say that packing is bad, so I choose File->ExternalData->UnpackIntoFiles, but it says autopack is disabled, and nothing to unpack

2. some say it only uses png and not jpg?  All of my textures are jpg...what a apin to have to convert to PNG, if that is the cause

3. some say memory and amount of textures?  This is 51 textures, 52mb

Any ideas?  I can't get it to save...argh.