Hmmm. I know that after some hosts disconnect, I need to search again a few times over the space of an hour to build up the results. I think the new term is "alternate locations," but I'm not sure when they are refreshed, where they are stored, or what their 1/2 life is . . . or if this is just in flux while the version changes are going on.

The new beta (2.9.5) reports the number of "Valid Alternate Locations" via tooltip info in the downloads pane, but I can't tell yet whether dropping a host loses the locations found. Trap_jaw wrote once that downloads can continue with no hosts connected (like on startup), so perhaps when the searches are too sparse, trying to connect to some new ultrapeers will work and not affect current downloads.

Ahhh . . . the speculations are endless. Which client/version are you trying today?