Cycle through open windows in Safari, Finder, etc etc.

I have a macbook pro running Leopard since it came out. I can't complain, everything works fine and one of the things I use the most is the Command+< combination to cycle between windows inside a program. I use it mainly on Safari, Photoshop and Pages.

Recently, while resizing some partitions very irresponsibly, an error erased my entire internal HDD. Long story short: I got everything back with third party software, recovered into a new drive, and after installing Leopard again on my macbook pro, I got my files back from the external drive and my OS is running as it was the first time. I could even recover my keychain!

Somethings, small things, have changed since that reinstall, and I can't solve them.

I can't cycle through windows the the Command-< combination anymore.
I've read all posts on this forum that deal with this issues and I've checked and rechecked that list of OS commands, where in fact there is one that says "cycle between open windows etc". It does not work. Not the Command-~, not the command-`, nothing. The later is even listed in my keyboard and mouse preferences (accessible through system preferences) and still I can't get it to actually DO what it describes.

I really want it back the way it was.

Since none of the other posters with this problem posted feedback as to finding a solution, I bring this problem back in hopes it gets more attention this time.

Thank you!