Problem with app on mac intel

Hi,
Up to today ardour was working fine (Mac Native version). However, for some reason, it will not open at all today. If I click on the app, Ardour atempts to open but fails almost straightaway without giviing an error message.

I tried re-installing and also changing to the non-Mac native version but the same happens.

I may have deleted an app recently which ardour needs but can’t think what that might be. Can anyone help? Do you recognise this behaviour in ardour?

(I’m on 10.4.11)

Many thanks,
Peter O’Doherty

UPDATE

Ardour2.crash.log gives me:

Command: Ardour2
Path: /Applications/Ardour2.app/Contents/MacOS/Ardour2
Parent: WindowServer [90]

Version: #{version} (2.4.1)

PID: 381
Thread: Unknown

Link (dyld) error:

Library not loaded: /usr/local/lib/libjack.0.dylib
Referenced from: /Applications/Ardour2.app/Contents/MacOS/Ardour2
Reason: no suitable image found. Did find:
/usr/local/lib/libjack.0.dylib: mach-o, but wrong architecture
/usr/local/lib/libjack.0.dylib: mach-o, but wrong architecture

Solved.
Something happened to jack which needed to be updated. Everything works fine now.