About ProKit 5.1 for Leopard (Mac OS X 10.5)
This ProKit Update fixes issues with user interface software resources that are shared by Apple's professional applications.
The issues addressed include:
Corrected an issue with improper scrolling behavior.
Resolved
memory leaks for improved performance.
Addressed layout of interface elements in certain application alert windows.
The update is recommended for all users of Final Cut Studio, Final Cut Pro, Motion, Soundtrack Pro, DVD Studio Pro,
Aperture, Final Cut Express, Soundtrack, Logic Pro and Logic Express.
http://support.apple.com/kb/DL1008