The "awaiting source" tells you that the host(s) of the file isn't online, or has moved the file, or deleted or renamed it. Since the network is global, you have to consider that some hosts are in defferent time zones getting on and offline at different times.
If you, however, try to download files with up to hundreds of hosts, you might not succeed because those files are mostly faked ones hosted by people that dislike P2P file sharing.

Whether it is worth to upgrade to LW pro,...hmm,... it will allow you to connect to 5 ultrapeers instead of 3 as well as it seems that the search results turn out to be better. The price of LW ($ 18.88, or the amount you send usually on a Friday night between 8-10 pm) is rather a symbolic price to help the developers to further develop the client. Without this, the whole network might have already broken down due to the increased use of it......

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"