Apple has released Final Cut Pro X 10.0.9, a small update that fixes issues that could result in green artifacts when using Sony XAVC media. The release also addresses problems with failed exports that were related to interlaced media and retimed segments, and includes the usual unspecified stability improvements. ($299.99 new in the Mac App Store, free update, 1.64 GB)
Turn Off Filename Extension Warning
In Leopard, Apple fixed an annoying aspect of working with the Finder in Tiger. Previously, if you changed a file's extension, the Finder prompted for confirmation. But since no one has ever accidentally changed a filename extension, Apple thankfully added an option to turn that warning off in the Leopard Finder's preferences. Choose Finder > Preferences, and in the Advanced screen, deselect Show Warning Before Changing an Extension.