smooth running 6.10 site is down after upgrading to 6.11

I had the same problem on one of my sites which is hosted on GoDaddy.

I found that by uncommenting the line "# RewriteBase /" in the .htaccess file, it fixed the problem.

I hope this works for you.

Hi,
Open the .htaccess file in a text editor, locate the line
# RewriteBase /
(should be around line 101) and remove the # from the beginning of the line.
Then repost that file to the root of you drupal install

line numbers aren't important, simply CTRL-F and put in # RewriteBase / that will take you to the proper place.

however if you want a decent free editor that does produce line numbers investigate notepad ++ ,http://notepad-plus.sourceforge.net/uk/site.htm

an easy way to get your site back up, is to go back to the back up you took before you updated your site. ex: just updating the files, won't be enough if you ran update.php as you would have had to have a backup of your database. Essentially the most important part of any database driven site.

I've updated 6 sites to 6.11 without issue, I don't believe this to be a bug and may be best to be further discussed in the forums.

I am not experienced with the error, I've never seen it.
Did you run update.php?
If so, did you get any errors when running update.php?
Have you tried to clear the database base cache tables?

This is not a forum but an issue queue, the upgrading forum is: http://drupal.org/forum/21

When starting this thread, it was request at the top of the form that you provide:

If you are reporting a bug, it needs to consist of three things:
What are the steps required to reproduce the bug?
What behavior were you expecting?
What happened instead?
Please include as much information as you can: OS, webserver name and version, PHP version, Drupal version, Drupal path, and everything else you might feel is relevant. There is no such thing as a bug report that is too detailed.

It's not that you are posting in the wrong place, I'm directing you to the forums where you may get more eyes on the thread.

side note: NEVER, do anything to your production site without first having a working backup of your database. Not following this best practice has has put more users in a position to have to rebuild their site than not following any other best practice.

please answer the first 2 questions and provide the requested information about the environment you are running drupal on.

researching the error some = http://www.google.com/search?hl=en&q=drupal+Call+to+undefined+function+u...

the error could be caused by drupal not having all the files necessary uploaded. Or a corrupted file that was uploaded. I'd deleted all files and folders except the sites/folder

I'd reupload all files from a new download.

clearing cache tables is done with phpmyadmin or similar tool in your hosts admin panel. find all tables marked cache_ or _cache checkmark them, adjust the dropdown to Empty, click go.

However, based on your responses I don't suggest touching the database without a backup. Focus on the files first. After reuploading all files again, and the problem is still there .... check out a few more threads that I've linked to in the google search.

nope, I myself am out of ideas. As previously stated a forum thread in the upgrade forum may get more eyes on it.

when you do so, it may be of benefit to list "all" modules that are enabled on the site and link to this issue in the thread you place.