Borderlands 2 Bug Wiping Progress for Some Players

A bug affecting some players of Borderlands 2 is apparently wiping unlocked progress on all platforms. As noted in a 33-page thread on the official Gearbox forums, some players are starting up the game to find Badass Ranks, golden keys, heads, skins and achievement progress reset to zero. Worse still, menus displaying the content or challenges don’t actually reset, meaning the game thinks the content is unlocked even if you don’t have access to it, so you can’t re-earn skins or replay challenges in order to get them back.

The bug in question can be seen in the video below from YouTube user RyogaWanderer: