Joomla! Forum - community, help and support

Hello, I am a new member and I do not know if they are in the right place for my cry for help.
After upgrading the site joomla 2.5 to 3.3.6 successful, I realized that from the back end when I try to modify the existing menu or create a new menu no longer accessed, appears
Can not display the page HTTP 500 error
/administrator/index.php?option=com_menus&view=menu&layout=edit
/administrator/index.php?option=com_menus&task=item.edit&id=20
everything else seems to be working properly, what can it be?
are blocked, if someone can help me out I would be grateful.
Thank You

extensions manager/ database tab/ Fix

i tried "extensions manager/ database tab/ Fix"
but nothing
some other things to do?
thank you

No one has any idea about?
No one has encountered the same problem?
All tips are welcome
Thank You