I also lost the ability to search and sort after upgrading from wordpress 3.5. However, my footer is still in place and the datatables script is loading. TablePress (and Table Reloaded) have been very reliable up until this point so thank you for any advice.
I an loading jquery 1.8.3 from googleapis. Is that no longer acceptable for TablePress?
Here is a sample page with a table that is no longer sorting or searching: https://www.hikespeak.com/southern-california/