If they are logged into different accounts, then the default save location is always in the user account. Why not get the person who is using the other's downld location to change it (LW's menu bar, Tools>Options>Saving.) Just to be sure, search for .limewire using the OS search engine & see how many you find. There should be a separate one for each logged in user. I'd be interested to hear how many you find.

The only possible reason I can think of why they're sharing the same downld location/preferences is that both users both have admin permissions. I noticed this on win 2k that it was possible. Which OS are you using?
I'm short on ideas at present. But you haven't provided lots of info about the set up.

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