Apple's GarageBand is a program that comes bundled with all Mac computers, allowing users to create their own music and podcasts.
It's a pretty neat program, and the latest version even includes video tutorials from the likes of Sting, Norah Jones and Sara Bareilles to help you learn how to play different songs.
So far, so safe. But now a security issue has popped its head up.
If you go to the GarageBand support download page you'll see that there's a new version of GarageBand out, version 5.1. Apple says that GarageBand 5.1 "addresses general compatibility issues, improves overall stability, and fixes a number of other minor issues."
What they have been a little shy about mentioning on that page, however, is that a security update has been sneaked in alongside the other improvements to the product.
It appears that GarageBand could change the security preferences on the Safari web browser to allow cookies to be accepted from all sites rather than "Only from sites I visit". That could mean that you were no longer blocking third-party cookies that advertisers can use to track your activity online.
If you're a user of GarageBand I would recommend you update to version 5.1 either directly from Apple's website or via Software Update.
Make sure, if you have run previous versions of GarageBand in the past, that you confirm Safari's settings are now set as you want them - not how earlier versions of GarageBand thought they should be.