The add-on shouldn't block anything on its own, so if there's a problem it's probably on some filter list that the user enabled. There's a pretty good way to debug these situations though, the network request log ( https://github.com/gorhill/uBlock/wiki/The-logger ). It will let you see the history of requests for a given page, and one of the colums in the log lets you fine tune what uBlock should do for that particular request - so, if you see that something that you don't want to be blocked is filtered out, you can reverse that and reload the page.
EDIT: in the latest release (0.9.9.0 at the time of this writing) the request log will also tell you which list provides the rule that blocks a particular request, it's pretty handy to debug this kind of issue.
EDIT: in the latest release (0.9.9.0 at the time of this writing) the request log will also tell you which list provides the rule that blocks a particular request, it's pretty handy to debug this kind of issue.