marketpress and gridmarket show "old" image of stores - won´t update...

I'm still not sure what e-commerce plugin and theme to go with and therefore I have play around with different plugins and themes. After once having the "nearly" perfect setup with marketpress and gridmarket. Now I'm back to marketpress (but changes to lite!!) and Gridmarket again. But...! , now my main shop won't update the products from my sub stores. Any idees why?
All other changes i do to the main store shows immediately, such as, color , global, local shop etc. but as i said i shows a old "image" of the products. Its also show product for a deleted test shop that doesn't´ exist anymore... ? help !

Kind Regards
Lars Baun