I found the solution:
1.for category : in csv type Categories (x,y,z...) instead of Categories (x,y,z,...)
2. I found a fix for images: replace content of controllers/admin/AdminImportController.php
with https://github.com/P...e3ebe473233d07.
This works for me.
Find the github link here:
http://www.prestashop.com/forums/topic/214816-153x-importing-with-csv-doesnt-create-imgpxxxxxjpg-and-imgtmpproduct-mini-xxxjpg/page__p__1060749__hl__category__fromsearch__1#entry1060749