When it comes to computers and software, you have to remember is that there is always change. New hardware comes out on a regular basis. For Apple, some the new Mac hardware comes out in the spring. But not always. As for software, it depends on the vendor. Some software get updated almost weekly. But most major (non bug related) software updates occur every 6 to 12 months.
Sometimes updating software can be annoying, like when your favorite software feature is discontented. Other times its a good thing, like when your old forgotten program is now improved and updated. Well last week a new version of VLC came out that included a lot of new features.
The new version is an awesome update that I highly recommend you get. However, the challenge comes when you try to use Handbrake to rip a DVD. The software update to VLC 2.0 breaks the ability to run Handbrake.
I explained how to rip a DVD in this post. If you re-read the post you will see that VLC is a required part of the equation when using Handbrake to rip a DVD. Because of the legal issues with DRM removal, Handbrake itself doesn't contain the required libraries. It uses VLC for that task.The issue is a that VLC version 2.0 is missing the required library.
To fix the problem you need to download and install the missing library from VLC. You have 2 choices, download just the libdvdcss.2.dylib file and move it to /usr/lib on your own or you can download an installer package which installs it for you. Either way, once the file is installed, Handbrake will work once again.
As a general rule most software updates don't usually break things. But if they do, use your favorite search engine and see if someone else has the same problem and has found a fix. I know it's goes agains all the laws of geekdom but as a last resort you can actually read the manual this often included with the software. Sometimes you might find your answer there as well.