How to check node permission rules? I'm using drupal commerce and I added a new product (and product display).
I can see it in the listing, but when a user click on the product page, it's saying : permission denied.
All the other products works fine, it's only the last one which doesn't.

I tried to rebuild the permissions but that doesn't changed anything. How can I check what is "denying" the page ?
Devel module has a submodule called Devel node access, it is really useful to evaluate and track permission problems on nodes. Enable it and place the blocks on a region you're using in your template.