So, is there anything going on re: updates on Tiger? If so, I’ve missed it.
If you have clicked on the Blue Apple Menu on your Menu bar and check Software Update... that will pick up any security updates available for Tiger.
The last OS update that affected Tiger was released on November 4, 2009.
Since then, Apple has released security updates for Safari, iTunes, and Quicktime that have affected OSX.4 Tiger, and those should also have been downloaded and installed.