Check that the following extensions are enabled:
AppleShare
Shared Library Manager
Shared Library Manager PPC
I didn't have AppleShare enabled, that was the problem for me. After that, try reinstalling iTools. Doesn't take long.
This did it for me -- but don't even try mounting an idisk through an alias if you're not connected to the internet -- it'll hang the system and you have to shut it down cold.
but idisk is working great and they've put tons of software there -- nice gesture
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it's only after you lose everything that you're free to do anything