Internal Server Error: after saving menu

Have you tried:

– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the Twenty Eleven theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress.

I deactivated every plugin and all, this method is also not solved the problem. But I solved the problem by reinstalling the old version of WP2.7. and then upgraded to the latest version.
I think there was a some conflict of plugins and WordPress v.3.2.1.
Thank you!

I assume you had WP2.7 installed before you installed WP v3.2.1. I’m having the same problem. My first install was 3.0 and I upgraded until I’m now using 3.2.1. Is it possible for me to install WP2.7 since I started with the newer version first? Would I lose all of my post and pages, if I try the same thing?

Thanks,
Jim

You don’t lose your posts and pages, if you’ll the following steps:

1. You must to import the database onto your computer MySQL from your
hosting.
2. Also you must to import posts, pages, comments, custom fields, categories, and tags from a WordPress export file to your computer.