Dialog windows could not be opened after opening CKFinder twice in a popup

Hello,

I upgrade from version 2.3.1 to version 2.4 (asp.net) to correct the upload problem with IE when CKFinder was running in a popup. This one is solve, but now CKFinder always close itself after opening twice (in a popup) with IE 8/9 (Chrome & FireFox --> OK).

I found a workaround, but I don't like it:
     I copy ckfinder.js from the previous version (v2.3.1) over the current one (v2.4)

This may cause other problems, but for now, everthing seems to work.

Regards,