Update Breaks Anonymous Shopping Cart

There seems to be a problem with Commerce Kickstart 2.51 update. I have two sites both of which are running Drupal 7.56. Both have received updates [site one: CK 2.49 to 2.51] and [site two: CK 2.50 to 2.51]. All of a sudden both of the sites are having issues displaying shopping cart items to anonymous users. Besides the regular updates of CK, no other permissions have been changed or modules updated.

If I may add, when an item is added;

1. Shopping Cart Modal pops up for anonymous user, but no items is listed in pop-up window
2. When Anonymous user go to the shopping cart page, it says the shopping cart is empty
3. Despite #1 and #2, when an admin goes to the active order page admin/commerce/orders, one can see the anonymous shopping cart items

I've come across similar post online but here are my take on those solutions;

1. They suggest; Anonymous user role has not been deleted.
   It is still intact in the database
2. They suggest: Change permission to allow Anonymous Users to View Any Product Type.
   I'm reluctant to do this as it's a security risk in my opinion
3. They suggest: Change settings for multiple views, by disabling SQL Rewrite
   This is also a security risk as Drupal tells you this when you try to disable SQL Rewrite

Thanks for your help in advance.