Commented Unassigned: Registered users cannot access insert image dialogue [7511]

I have installed 2.07 (migrated from 2.06)

My host user has no problem using the image insertion/upload dialogue
When a registered user clicks to open it, the whole screen greys out and freezes and the popup never appears.

I've tested in IE, firefox and opera
Comments: ** Comment from web user: gdemotchkine **

yes in fact, Firebug:

ReferenceError: ucFirst is not defined
[Break On This Error]
url = editor.config['filebrowser' + ucFirst(dialogName) + 'UploadUrl'];

here's a more complete excerpt
```
if (element.filebrowser.action == 'QuickUpload' && element['for']) {
var url = element.filebrowser.url;
if (url === undefined) {
url = editor.config['filebrowser' + ucFirst(dialogName) + 'UploadUrl'];
if (url === undefined)
url = editor.config.filebrowserUploadUrl;
}

```
I do not think there's any other usefull information

Let me know if I can help in any other way.

Thanks!