Since 3.1.6 upgrade admin users getting 'forbidden access'

Hi Jose I have already started uninstalling component so I can install it fresh to see if that helps. If not I will contact you with admin details.

Hi Jose, there is definitely something wrong. I have gone to a second site updated to 3.1.7 (this site does not have k2, has SP page builder). And I am having the same problems. After upload, I open Page builder and just try to save the page. Off it comes "forbidden access".

Here is log.

Just sent you details