This was not the problem all along for sure, since some of our customers have experienced the same thing, and we do not have the uploader in a pop-up.

 

We still have clients reporting the error after the new version, but we are still investigating to make sure they have in fact cleared their browser cache.

 

Do we have any options to completely avoid flash/sl? I have tried setting the UploadType to IFrame, but that simply doesnt work at all, no file dialog window is opened.