I had a problem for a while that I couldn’t launch iSync normally from /Applications, but it did still did work launching it from /Applications/iSync.app/Contents/MacOS/iSync . I knew this must be an issue for someone else as well so a little digging got me the anwser from the Apple Support discussion with title “iSync won’t open in 10.5.3.”.
- Fix iSync launching problem
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- Drag iSync from Applications to Desktop.
- Drag it back to Applications.
- Try launching it normally.