Well, here is what I am experiencing. There is a strip of hook material, approximately 1/2 inch wide, at the end of the tab (right behind the green portion of the tab that makes it easy to grab). This strip of hook material is glued to the tab. It is the adhesive that is holding the strip of hook material to the tab that is failing.
The first two diapers that I sampled from Provider's Choice had a blue liner and worked fantastic. Everyone had raved about how well the tabs held so I used them when I would be very active and they held amazingly well, even after refastening them more than once.
I ordered a case when the mediums came back in stock and the new diapers have a white liner, and the hook strip on the tab is having the issue I describe above. I'm having good luck reinforcing them with staples as I indicated in a previous post, but I am really hoping that the problem will be fixed before I need to order more.
The next time I am going to be around the house for an extended time I will wear one without reinforcing it to get pictures of the failure. In the meantime I would expect that you could get one to fail without too much difficulty just by fastening one and putting some stress on the tabs.