PhpStorm no longer locating all errors/warnings

Hi all,

PHPStorm newbie question.

I'd installed PHPStorm yesterday and was really, really impressed. It  identified countless small issues with my code, like referencing  non-static classes statically - I loved that it highlighted the problems  in my open PHP files. There was a bit long list in the "inspection  results" section which identified hundreds of small errors in various groupings. I didn't spend too much time on it at the time - this was all I noticed.

Today I can't get it to identify any errors at all, other than "Typos".

Clearly I messed up a a configuration somewhere, but I'm pretty  baffled as to where. I've been through the Preferences section for the  last hour trying different things, but can't get it to work as before. I've checked virtually everything in my inspection profile but no luck.

Any tips...?