Problem with combinations 1.7

[jpalks]

Hello I have made a site that we have now passed the products, I deal with the problem I have built the qualities I want and when I put the categories of properties I want in the product does not get them and if I go to work on the product throws a mistake.  (screen 1) 

 

 

if I choose them all I need to load them no matter if I'm backing up generate an error (screens 2 & 3) now if I go to  list of products and press the product to process it throws a bug (screen 4) the only thing I can do is to erase the product.  I am in version 1.7.5.2 but with a previous version the same is done.  if I pass the 2 categories of 3 with the combination working normally, so I notice that if you put some combinations and you want to add and others do not get them displays the box with the list saying it chooses combination on the frontend but it is empty