TYPO3 Core

Same here.

my TCA:

'link' => array(
            'label' => 'LLL:EXT:cms/locallang_ttc.xlf:header_link',
            'exclude' => 1,
            'config' => array(
                'type' => 'input',
                'size' => '50',
                'max' => '256',
                'eval' => 'trim',
                'wizards' => array(
                    'link' => array(
                        'type' => 'popup',
                        'title' => 'LLL:EXT:cms/locallang_ttc.xlf:header_link_formlabel',
                        'icon' => 'link_popup.gif',
                        'module' => array(
                            'name' => 'wizard_element_browser',
                            'urlParameters' => array(
                                'mode' => 'wizard'
                            )
                        ),
                        'JSopenParams' => 'height=800,width=600,status=0,menubar=0,scrollbars=1'
                    )
                ),
                'softref' => 'typolink'
            )
        ),

Works with wizard_link instead of wizard_element_browser

'link' => array(
            'label' => 'LLL:EXT:cms/locallang_ttc.xlf:header_link',
            'exclude' => 0,
            'config' => array(
                'type' => 'input',
                'size' => '50',
                'max' => '256',
                'eval' => 'trim,required',
                'wizards' => array(
                    '_PADDING' => 2,
                    'link' => array(
                        'type' => 'popup',
                        'title' => 'Link',
                        'icon' => 'EXT:backend/Resources/Public/Images/FormFieldWizard/wizard_link.gif',
                        'module' => array(
                            'name' => 'wizard_link',
                        ),
                        'JSopenParams' => 'height=800,width=600,status=0,menubar=0,scrollbars=1'
                    )
                ),
                'softref' => 'typolink'
            )
        ),

Well - the old wizard was broken and is now replaced automagically with the other wizard. So actually it was not intended, but we won't fix it anymore.

My problem was the extension "compatibility6". I disabled it, and it worked again.