Both the Logic Pro 9.1.3 update (193.1 MB) and the Logic Express 9.1.3 update (139.68 MB) improve general stability and compatibility and addresses issues including:
- Resolves problems related to the support of Hyper-Threading
- Improved compatibility with 6 and 12-core Mac Pro systems
- Support for iOS control surface apps that utilize the OSC protocol
- REX files now supported in 64-bit mode
- Improved compatibility with select Audio Unit plug-ins
Further details on the Logic Pro update can be found here, and on the Logic Express update here.