Yup, that did the trick. After my last reply, here's all I did:
1. Disk Utility --> Verify & Repair Permissions
3. Delete the ~/Library/Application Support/EarlyInnovations folder
4. Delete the ~/Library/Application Support/Cache/EarlyInnovations folder
PhotoLinker started up like good ole days. Thank you!
Also, I'm not too worried about losing the tracks within PhotoLinker - I keep a a GPX file, one per calendar day, in a separate folder (details here: http://sgowtham.net/blog/2009/02/12/php ... -in-mysql/
) and can import them back into the application.
Thanks again for your time and help with this.