As an addendum, I was about to start a thread on PD1 and gratitude. In researching, I found this thread and it seems that not only is my question answered here but that it also ties up a loose end in the thread.
From Don in the initial post:
QuoteBeing affected by anger as a sickness or weakness makes sense, but why would being affected by gratitude be a sign of weakness? One conjecture would be that it would show a lack of self-reliance / αυτάρκεια.
The word "gratitude" seems problematic as, to me, one who is blessed would experience a general sense of gratitude. Denying gratitude seems quite un-Epicurean! The wiki translation in post #15 gets to a more accurate sense of the doctrine in my opinion: "indebtedness," or "favors" as they translate it in their first pass.