Existing users, 
1) Trash the ~/Library/Application Support/Acquisition/ directory.
2) Repair your file permissions:
http://docs.info.apple.com/article.html?artnum=25751
3) Try again.
These were the instructions I received from the developer. I did #1 by itself and the problem was fixed without needing to reinstall the app. Good luck!
Acquisition
Peer-to-peer file sharing client.
Version: 2.1
golucid - try this
Feedback Type: Troubleshooting Report
Contributed by: BJF Sunday, October 03 2004 @ 06:47 PM PDT
Product Platform: MacOSX
Used Product For: 6-12 months
System Info:
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