Fixed.

It won't.  Sitewide settings will trump individual settings.  You could set the site to require validation then set everyone BUT her to...

It's written into the script that it's required. 

Uninstall it and reinstall it.  Something didn't get added right in the database.

It's a bug.  Update to 3.5.  I think I've got it fixed.

I don't think that's your version of mySQL.  I think that's your version of phpmyadmin.  I can't see anything wrong with...

Moving this out of bug reports.  If it was a real bug others would have reported it by now.  To get rid of the notice error turn debug off i...

session_start is called in header.php on line 56.  You need it above that.  I would guess you probably didn't get the path right.

I have merged your 2 topics together.  Please read the manual.  Please check out the admin area of your site.  You can answer a lot of ...

Do a search in the stories table for a story with an empty categories field or one set to 0.

Re-upload the 3.4.3 files again.  I think you may have missed some.

You should also keep it off unless you're debugging a problem because while the information it outputs will help you find bugs, it can also help ...

You're several versions behind the current.  This is already fixed.

It's not possible as written.  You'd have to modify includes/categories.php and the javascript that controls it.