What to do when the manager interface goes nuts?

This is based on my experience, and I thought it would be nice to share.

After one of the unsuccessful restore sessions following an unsuccessful beta upgrade from 2.0.0. beta 3 to 4 or 5, I was presented with a pretty messed-up top menu in the manager interface. The menu looked like this:
Buggy Manager Interface.

Looking at the source code of the wrongly rendered page, I could not see what url corresponds to what menu option.

So I needed to manually set some things in the modx_system_settings table, using PHPmyAdmin.

Nothing happened after I put some new values and I needed to trigger the Modx to refresh, somehow.
As I didn’t have the staging server, typing one by one action value, I figured what url is to be called in order to refresh site: /manager/index.php?a=62&

After opening that url, the script would be executed and the changes in the database would be re-read.

This is also important to know if you want to manually set modx Revolution in the "site unavailable" state using site_status key and setting it to 0.

I also found what is the URL of the system settings page: /manager/index.php?a=61&
You may read those URLs in the manager interface and just don’t care.

SO what is the point of my post?
It is a good practice to have all the important URLs BOOKMARKED if you don’t want to end like me, guessing things, in case your manager user interface goes bananas and you don’t have the exact installation of modx on some staging server.

Now, do you have any similar advice to share related to messed-up manager interface?

In Revo, if you change things directly in the database, you can manually delete the /core/cache/* files and they will automatically be recreated with the new values on demand.