Is this the link you are going to? https://subeta.net/quests.php/library

If you're still having issues, could you please provide your browser and operating system? Make sure you rule out the interference of custom CSS, adblocker, browser extensions, userscripts, etc as well - just in case.

(I was able to visit and complete a quest just now with no problems...)

Thanks! Looks like a redirect got broken. Just pushed a fix. :)