[1.7.2.5/1.7.3.1]Product ID cannot be saved

[House of Astley]

So, i am currently using Prestashop 1.7.2.5 and everything is nice and happy, all bugs have been fixed to some extent and my shop is in a happy condition however i recently upgraded to 1.7.3.1 which lists a LOT of decent changes. I can upgrade to this version and everything on the front end works perfectly fine however the backend is a bit broken and i cannot import any products whatsoever. For example, i can import a csv on 1.7.2.5 with no issue with say 10 products, if i then use that exact same csv on 1.7.3.1 it fails on the first product and tells me that every product cannot be saved. I'm not entirely sure why this is but i'd really like to use the current version with a working import as we import products every day for stock changes. Please see attached screenshot of the error i get when importing.

Edited April 17, 2018 by House of Astley (see edit history)

[House of Astley]

Could really use a solution to this problem