I say its sorted - and it is in that they all now work.. however if i add a new product (even if i just put test in all the fields) it adds the product but the category page then is blank as per before.

If i move the product to another category - the category it was in re-appears and the new page is blank. It's so odd and seems to only appear when i add products to the gifts & accessories category (which i deleted and re-made since the last problem!)

To make it even weirder - i deleted two products as a part of my investigation and i re-added one of those just fine, but the 22nd product always kills the page whatever it is!

I'll just have to not add any more products to that category!