I have just checked and I am on 1.0.3807, which is working fine.
Yesterday was a cold-sweat nightmare. I struggled for several hours trying to shut down/reboot/safe mode start before being able to uninstall Malwarebytes. I reinstalled but Malwarebytes stalled after updating , so I reinstalled over the existing installation, and that seemed to do the trick.
For some weird reason, I have had to reset a few of my Windows parameters, but this is small fry compared to yesterday's complete nightmare.
Malwarebytes is supposed to prevent problems, not cause them. How infuriating. How disappointing.