When clearing cache

[idm1]

Hi

 

I was wondering if anyone can shed any light on whats happened to my store after upgrading to 1.6.

 

When I clear the cache and click on a product - it no longer links and I get an error "Product not found"

 

There are a few layout issues as well

 

I had backed up the cache folder so uploaded that again and the site is working as it should.

 

Any ideas why there are layout issues and the products aren't linking after clearing the cache?

 

Thanks