Hi

To answer your other questions:

By grouping like host sources together, you achieve two potential benefits:

(a) you may get two or more sources to download simultaneously which, by a process happily described as an avalanche, downloads your desired material more quickly than from a single source; or

(b) gives you a safety net to a stalled download. If you have a single host and it fails, you have to take remedial action to recover the connection or identify another source. If you are using a grouped source, when one host fails, you will automatically be passed on to the next host in the group that is free.

The reason for you seeing many more "unable to download" messages has nothing to do with your settings in the Preference boxes. It is simply that the number of people using Gnutella has been increasing dramatically but, sadly, the majority are unsociable and only take, tantalising the world with a list of hits that will never be given. You have to be very active to search and then repeat the searches over time so that you identify as wide a spectrum of potential sources for the material you want as possible. Persistence and a refinement of searching strategies is required on your part.