Ok, I messed with it tonight and I get the same thing as you, but I think I made some progress. I think it might be tied to your level. I added some levels to the character and I got more choice of skillbooks. Try giving yourself some levels using CTRL-SHIFT-L while on top of your character and speak to the vendor again.
I think you are right with the Export too, I got that bug too on another mod. I would kill for some documentation on this part of the Editor, oh well.
