A GarageBand project would not open

Hello,

We have spent the whole day on creating a project in Garageband. Having saved and quit it for a short break it would not reopen. We are using the Mac OS X 10.7.5, 3.06 GHz Intel Core i3, 4 GB memory and the newest version of GB. We also use the m-audio 2626 interface for audio recording. All other GB projects open normally. We have successfully repaired the disc, though we cannot repair the permissions - the verification shows some 40 permission differ and a SUID file, which has been modified though will not be repaired. Is there a chance to get to the song?