Wiki

Hi.

This issue is breaking my brain.

When I try to save changes in a wiki page the MOODLE webpage hags up and after a while Firefox says to download the "view.php" file.

No matter how simple or complex is the wiki page, when I try to update it hangs up.

I open a "error console" in my web browser and read this messages:

ERROR 1: Go into the WIKI PAGE

content javascript error in https://oe.asignaturas.usb.ve/moodle/lib/yui/connection/connection-min.js:
YAHOO.util.CustomEvent is not a constructor

ERROR 2:GO TO "EDIT MODE" of WIKI PAGE:

content javascript error in https://oe.asignaturas.usb.ve/moodle/lib/yui/connection/connection-min.js:
YAHOO.util.CustomEvent is not a constructor

ERROR 3: I EDIT THE WIKI AND TRY TO SAVE.

content javascript error in https://oe.asignaturas.usb.ve/moodle/mod/wiki/view.php?id=1510&page=edit/Inventario%20de%20objetos%20instruccionales:
YAHOO.util.Connect is undefined

content javascript error in https://oe.asignaturas.usb.ve/moodle/mod/wiki/view.php?id=1510&page=edit/Inventario%20de%20objetos%20instruccionales:
YAHOO.util.Connect is undefined

content javascript error in https://oe.asignaturas.usb.ve/moodle/lib/yui/connection/connection-min.js:
YAHOO.util.CustomEvent is not a constructor

ERROR 4: GO INTO THE WIKI PAGE AGAIN

content javascript error in https://oe.asignaturas.usb.ve/moodle/lib/yui/connection/connection-min.js:
YAHOO.util.CustomEvent is not a constructor

ERROR 5: EDIT AND SAFE AGAIN

content javascript error in https://oe.asignaturas.usb.ve/moodle/lib/yui/connection/connection-min.js:
YAHOO.util.CustomEvent is not a constructor

ERROR 6: GO INTO WIKI PAGE FOR LAST TIME AND USE THE FULL SCREEN EDIT POPUP

content javascript error in https://oe.asignaturas.usb.ve/moodle/mod/wiki/view.php?id=1510&page=edit/Inventario%20de%20objetos%20instruccionales:
YAHOO.util.Connect is undefined

!!!THE MOODLE HANGS UP!!! ... and the error console shows this message:

content javascript error in https://oe.asignaturas.usb.ve/moodle/mod/wiki/view.php?id=1510&page=edit/Inventario%20de%20objetos%20instruccionales:
YAHOO.util.Connect is undefined

My MOODLE version is 1.9.

I downloaded the latest (1.9.5+) and replaced the "mod/wiki" directory but same problem.

I did all tests in Firefox. I used Internet Explorer and apparently the problem is overrided and the page shows fine.

What it could be?

Thanks in advance.

José.