Csv file problem - debian update messed it up?

I’ve been running click cart pro shopping cart software for over 2 years. Yesterday evening the cart stopped displaying data from the csv file with all the products. I haven’t changed anything so I’m guessing that the recent Debian 3.1 somehow messed something up. I tried uploading older back up versions of the file but it does the same thing. The only thing that helped was too delete most of the products so the 1.6mb file was only 70k. Now I can display only 50 of my 500 products.

My store is here: https://shoppingcart.djangobooks.com/

Does anyone have any idea how to fix this?