TYPO3 Core

Same Problem here on two websites, after upgrading from 4.1.6 to 4.2.1 and changing from PHP 4.6 to 5.2.6. All other tabs work correctly, the issue seems to be limited to the user preferences tabs.

No Problem occuring on another website with 4.2.1 which was originally created with 4.2.0 and updated to 4.2.1.

Tested on Firefox 2.0.0.14 and IE7, both reporting Javascript Error:

Error: DTM_array is not defined
Source: typo3/sysext/setup/mod/index.php?
Line: 119

Error: Prototype is not defined
Source: typo3/sysext/setup/mod/index.php?
Line: 35

DTM_mouseOver and DTM_mouseOut are also not defined.

Same here after two upgrades from 4.1.7 to 4.2.1, no JS errors though.
tested on FF 3 and IE7

no problems with clean 4.2.0 install and 4.2.1 update

I just stumbled over that same problem, and it turned out that the problem came from one of the installed extensions, which XCLASSed some major core classes.

In my case it was mn_ff3_be_bugfix, which XCLASSed typo3/class.alt_menu_functions.inc. This particular "bugfix" is no longer required, so de-installing that extension fixed the problem.

Look our for extensions ext_localconf.php for stuff that XCLASS typo3/alt_*.* files, those might be in your way. Report here what you found out so it can help others.

Resolved, no change required:

This is very likely not a core, but an extension problem xclassing core files.

Please reopen if this issue still exists in a "clean" installation.