Need your Mac Help again Guys....

Since upgrading our server to 10.5.7, the macs in the Music suite are having problems with Reason 4.

When a student logs on and runs the program, it crashes and wants to send the report to Apple.

In the crash log it mentions: KERN_INVALID_ADDRESS at (Random Hex)

But if I log on as a local admin, and run Reason it loads fine. Have tried deleting the local profile, but still happens. Have not tried it with a Staff Logon, but assume it doesn't work aswell.

Clients are 10.5.6, and it was working fine a couple of weeks ago, bit strange it has stopped on all the macs. Have tried updating them to 10.5.7 but still the same error.

Cheers once again.