Advanced warning: you may find that OS X 10.10.3, currently in test, breaks some of your recent apps, and that they need updating before you can use them again.

Some software vendors are already warning that changes due to roll out in the 10.10.3 update break the latest releases of the products, and are working on fixes. It may be wise to check compatibility with your key apps, and apply any necessary updates to them, before installing the 10.10.3 update, when it is release to the App Store.