I wonder how many people are aware of the default settings in QA Checker 3.0?
I only mention it because when recreating my Project templates in Studio 2015, I was reminded that most of the checks are not enabled, and it is worth running through them (Project Settings > Verification > QA Checker 3.0) whenever a new template is created.
Packages received from translation company clients are invariably in default (unchecked) mode - it's worth noting that the package settings will apply rather than one's own!