I have a site with Captcha module installed and Image captcha submodule working perfectly before upgrading.
I followed the recommended steps, and even did it in a nearly identical test site. Everything worked perfectly in the test site. But when I applied the changes (updating from previous core version) in production, I realized that Image captcha is not only not working anymore: it even doesn't appear as submodule in Admin.
The folder is there but is no longer detected. I am thinking of reinstalling the complete Captcha module, but I am very worried about the rest of modules.
Going back to my backup of my database is not an option as I realized the problem after 2 days and that means losing a lot of data (if I would restore my backup).
Any tip on what could be causing this?