Button 'Find Faulty Feature in Farm'
With this one click, you can check, if there are any errors in any Feature Collections (Farm, WebApplication, Site or Web) in your farm. If this runs through the farm and tells you "No errors found", all your farm's feature collections are clean.
(If it finds a faulty feature of scope Web or Site, you can browse in the left window to it and see the errors in the Register of the Site and Web Features (yellow).
Once, it finds a faulty feature, you can let it be deactivated in / removed from the whole farm.