Using the PHP version of 2.2 the upload dialogs were broken. This is what I did to get mine working.
In the fckconfig.js file I had to change references from "FCKConfig.QuickUploadLanguage" to "_QuickUploadLanguage".
------------ See Below ------------------
FCKConfig.LinkUpload = true ;
FCKConfig.LinkUploadURL = FCKConfig.BasePath + 'filemanager/upload/' + _QuickUploadLanguage + '/upload.' + _QuickUploadLanguage ;
FCKConfig.LinkUploadAllowedExtensions = "" ; // empty for all
FCKConfig.LinkUploadDeniedExtensions = ".(php|php3|php5|phtml|asp|aspx|ascx|jsp|cfm|cfc|pl|bat|exe|dll|reg|cgi)$" ; // empty for no one
FCKConfig.ImageUpload = true ;
FCKConfig.ImageUploadURL = FCKConfig.BasePath + 'filemanager/upload/' + _QuickUploadLanguage + '/upload.' + _QuickUploadLanguage + '?Type=Image' ;
FCKConfig.ImageUploadAllowedExtensions = ".(jpg|gif|jpeg|png)$" ; // empty for all
FCKConfig.ImageUploadDeniedExtensions = "" ; // empty for no one
FCKConfig.FlashUpload = true ;
FCKConfig.FlashUploadURL = FCKConfig.BasePath + 'filemanager/upload/' + _QuickUploadLanguage + '/upload.' + _QuickUploadLanguage + '?Type=Flash' ;
FCKConfig.FlashUploadAllowedExtensions = ".(swf|fla)$" ; // empty for all
FCKConfig.FlashUploadDeniedExtensions = "" ; // empty for no one
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In the fckconfig.js file I had to change references from "FCKConfig.QuickUploadLanguage" to "_QuickUploadLanguage".
------------ See Below ------------------
FCKConfig.LinkUpload = true ;
FCKConfig.LinkUploadURL = FCKConfig.BasePath + 'filemanager/upload/' + _QuickUploadLanguage + '/upload.' + _QuickUploadLanguage ;
FCKConfig.LinkUploadAllowedExtensions = "" ; // empty for all
FCKConfig.LinkUploadDeniedExtensions = ".(php|php3|php5|phtml|asp|aspx|ascx|jsp|cfm|cfc|pl|bat|exe|dll|reg|cgi)$" ; // empty for no one
FCKConfig.ImageUpload = true ;
FCKConfig.ImageUploadURL = FCKConfig.BasePath + 'filemanager/upload/' + _QuickUploadLanguage + '/upload.' + _QuickUploadLanguage + '?Type=Image' ;
FCKConfig.ImageUploadAllowedExtensions = ".(jpg|gif|jpeg|png)$" ; // empty for all
FCKConfig.ImageUploadDeniedExtensions = "" ; // empty for no one
FCKConfig.FlashUpload = true ;
FCKConfig.FlashUploadURL = FCKConfig.BasePath + 'filemanager/upload/' + _QuickUploadLanguage + '/upload.' + _QuickUploadLanguage + '?Type=Flash' ;
FCKConfig.FlashUploadAllowedExtensions = ".(swf|fla)$" ; // empty for all
FCKConfig.FlashUploadDeniedExtensions = "" ; // empty for no one
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RE: PHP file uploader failure