Transfer Queue Problem--authentication

Hello, I can see in my transfer queue log that I'm failing authentication at the regular intervals that the client tries to reinitiate the download, resulting in no tranfer. This seemed to begin occurring out of nowhere about a week ago. Is there seperate place for credentials when initiating a transfer through the queue? This wasn't a problem for me in the past, but I've just begun NOT saving passwords in my favorites. Also, ad-hoc drag and drop transfers work just fine.