There is probably a problem with this file (corrupted?)
Check what I got from Logic Pro Late 7.2 breaking news:
Logic and Intel or PowerPC Macintosh Systems Logic Pro 7.2 is designed to run natively on both PowerPC and Intel-based Macintosh systems.
This impacts in the following ways:
For technical reasons, all song conversions between Logic PPC and Logic Intel will
remove the Undo history. Songs saved in Logic 7.2 PPC can be opened with any Logic release between 7.0 and 7.1.1, ensuring that PPC Logic 7.2 songs remain compatible with earlier Logic Pro 7 versions and vice versa.
Songs saved in Logic 7.2 PPC can be opened with Logic 7.2 Intel (and Logic 7.2 PPC).
Songs saved in Logic 7.2 Intel can be opened with Logic 7.2 PPC (and Logic 7.2 Intel).
Songs saved in Logic 7.2 Intel can not be opened with earlier versions of Logic
(Logic 7.1.x or earlier). This means that Logic 7.2 Intel songs are only upwards
compatible (Logic 7.2 Intel can open older songs but not vice
Note: Should you wish to make Logic 7.2 Intel songs compatible with Logic 7.1.x,
simply open the song in Logic 7.2 PPC and save it.
I hope it helps, otherwise check with the experts :-D