When the sfMediaLibrary is installed and the app.yml configuration has these lines:
rich_editing: on
tinymce_options: file_browser_callback:"sfMediaLibrary.fileBrowserCallBack"
the insertion of an image in a text-area, pops up the image window, containing the file-browser icon near the URL field.
Clicking on that icon, nothing happens and the following js error appears in the console:
tinyMCEPopup.windowOpener.sfMediaLibrary has no properties
http://ep20/js/tiny_mce/tiny_mce_popup.js
Line 272
This has been already discussed here.
A possible solution is to patch the sfSimpleCMSSlotRichText.getSlotEditor() method, in sfSimpleCMSPlugin/lib/slotType/sfSimpleCMSSlotRichText.class.php
The patch is attached.