On that topic, it's unclear as to exactly how the Professional Abilities are gained.
Do you get all of the listed abilities immediately upon entering a new tier?
Do you only get one per Professional Level (this is my assumption, considering there are 4 per tier for the lower tiers, but only 3 at Master tier)? If so, do you choose which one to gain, or are they gained in order?
Also, another thing that needs to be cleared up...
Are Free Skill slots gained at every level or only when advancing tiers? Page 269 of the Players Guide mentions that "Advancing in tier is the only way that Characters gain slots for Free Skills", but the table on page 266 shows Free Slots being gained at every Professional Level.