Symptoms
I am trying to import an Action List or PDF Profile in PitStop Pro, but the file I want to select is grayed out and therefore makes it impossible to import it into my database.

Cause
PitStop Pro only lets you import Action Lists or PDF Profiles when the files contain their proper extension, .eal (for Action Lists) or .ppp (for PDF Profiles).  Make sure the extensions are correct before trying to import.
In addition, if you are importing an Action List or Preflight Profile created in a more recent version of PitStop Pro, you may not be able to import because features in the Action List or Preflight Profile may not be available in the older version you are importing into.