TYPO3 Core

Hello

I already have found and tried several hints on this issue. After updating a installation from version 4.2.8 to 4.4.7, the rte doesn't load anymore and only show the message "The editor is being loaded. Please wait...".

A Javascript error "'Ext' is undefined" occur, refer to additional information.

1. I have uninstalled and deleted the old (local) version
2. I have installed the latest (system) version.
3. I have deleted all temp-files with the install tool
4. I have deleted the browser-cache
5. There is no relevant additional extension installed (like date2calendar)

Any ideas?

Thanks & best regards,
Andre

Error-Message:
--------------------------------
Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; MS-RTC LM 8)
Timestamp: Fri, 25 Mar 2011 12:39:00 UTC

Message: 'Ext' is undefined
Line: 39
Char: 1
Code: 0
URI: http://www.XXXXXXXXX.ch/typo3temp/rtehtmlarea/htmlarea_cumulative_cd2c5385aad056a1817e.js?1301056624
--------------------------------

Details of the relevant codelines (starting at row 36):
--------------------------------
// Avoid re-initialization on AJax call when HTMLArea object was already initialized
if (typeof(HTMLArea) == 'undefined') {
// Establish HTMLArea name space
Ext.namespace('HTMLArea.util.TYPO3', 'HTMLArea.util.Tips', 'HTMLArea.util.Color', 'Ext.ux.form', 'Ext.ux.menu', 'Ext.ux.Toolbar');
/*************************************************** * CONSTANTS
*******************************************/
(issue imported from #M18034)