Found this at PalmOne:
The Mac OS X installer includes an "Archive and Install" option. When you upgrade your Mac OS to a newer version of OS X, and select the "Archive and Install" option from the installer's "Select a Destination: Options" panel, you may receive the following error upon restart or attempting to launch HotSync Manager:
"The application "HotSync Manager" could not be launched because of a shared library error: "4<HotSync Manager><HotSync Manager><HotSyncLib.PPC>"
Explanation: The Archive and Install option in the Mac OS X installer does not copy these files from the archived System and Library folders to the new OS installation. HotSync Manager requires these files to run properly.
Workaround: You must re-install Palm Desktop from the CD included with your handheld.
Well, I didn't do an "archive & install", but rather a clean install. Anyways, the problem is that I can't use the workaround since I don't have a cd with the used unit I purchased. I wonder what other options there are.