Hi Paizo
Historically, paizo books have (usually) only had the errata released and the PDFs updated when a new printing has been received and become available through paizo.com.
I understand that has changed recently and I've seen at least one other person experience the same as me - namely buying a book from the store thinking it would be in line with the errata-ed version, only to discover that it was "old stock" from prior to the errata's release.
I realise there was a lot of pressure to get errata out earlier for those using electronic versions, but I wonder if you would be able to update the webstore to make it clear which printing is in stock?
I generally update my copies of rulebooks once the errata have been incorporated and that used to be easy to manage but now there's no easy way to know when I should pull the trigger on getting a replacement copy.
Cheers
Steve