Oh, oh, I got one! You can try typing in the search field the name of the file you are dlding and that has the Need More Sources status, before you click on the "Find more Sources" button. First click "Search" (after you're done typing of course) and then click Find more sources.
If that doesn't work then dld files with more sources (larger numbers under the # column, in case you didn't know)

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-