If you upgrade to 10.5.3 today and you've previously applied the translucent menus fix by injecting some of the 10.5.1 pieces into your System, your computer will hang upon restart and nothing will run. I had to log in via SSH and fix it myself with the Terminal... it wasn't fun but, I'm back to normal now... some others might not like the Terminal as much. This is a warning... don't do it.
Here's the thread where we fixed the Translucent menus https://forums.macrumors.com/threads/433039/
Here's the thread where we fixed the Translucent menus https://forums.macrumors.com/threads/433039/