Upgrading Drupal

I upgraded to 6.13, but made a couple errors when I did so. I ended up restoring my previous backups, but suddenly that no longer worked properly for some reason. My site was working fine when I backed everything up, but from what I can tell some files did not get backed up like they should have. This was readily apparent with my images. Anyway, I went back and restored my image files and then did the upgrade again, properly. My site is now working (basically), however I cannot access any admin pages at all, and my theme is not working.

I am trying to update my Drupal site from 6.10 to 6.13, and I did the steps in the update.txt, deleting the drupal folder and copying 6.13 into the folder. But when I try to run update.php, it just says 0 of 0 updates and flies through and when i look in the admin screen, it says I am still running 6.10.

Hello I just upgraded my site to 6.13, and all nice menus don't work anymore....... I've tried to delete the directory containing the module, then to download and install "nice menus model 6.13", but nothing changes: menu are displayed as plain text, with links to pages overwritten one upon each other... awful, obviously...... moreover I've one menu (which was once a nice menu) that is impossible to delete........

Just updated from 6.12 to 6.13 with no hitch. However, I get this problem when new users try to sign up.

Site: http://nwa.fandomcafe.com

ok i upgraded the test drupal and i see this?
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User signatures no longer inherit comment input formats. Each user's signature now has its own associated format that can be selected on the user's account page. Existing signatures have been set to your site's default input format.
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and this is in a grey box:
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The following queries were executed
system module
Update #6051

I was getting lots of errors after I upgraded to Drupal 6.13. The site was running a bit slow before then, but after the upgrade, it was breaking more and more.

If I tried to access the site, I got a Garland-themed Drupal error page saying:

Site off-line

The site is currently not available due to technical problems. Please try again later. Thank you for your understanding.

If you are the maintainer of this site, please check your database settings in the settings.php file and ensure that your hosting provider's database server is running. For more help, see the handbook, or contact your hosting provider.

The mysql error was: Lost connection to MySQL server at 'reading authorization packet', system error: 0.

I had just visited that same page five minutes beforehand (after I upgraded), and it worked fine.

So, I opened a different browser (IE), tried going to the site root, and got an HTTP 500 Internal Server Error.

Checking the error logs from my website, I got lots of entries like this:

[Thu Jul 02 15:02:58 2009] [error] [client 96.237.0.45] Premature end of script headers: index.php, referer: http://www.EXAMPLE.com/
[Thu Jul 02 15:02:58 2009] [error] [client 96.237.0.45] File does not exist: /home/EXAMPLE/EXAMPLE.com/internal_error.html, referer: http://www.EXAMPLE.com/