Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
From where did you install uBlock? If it's from the Chrome store, the extension package is signed to guarantee its content cannot be modified. I believe if the package is modified -- i.e. if the signature in the package does no longer match the content -- Chrome will disable it automatically.