I have a repeatable field group with two fields, a textfield and a WYSIWYG field.
If I try to add an image into the WYSIWYG field using the media browser, it will hang and never add the image. (using Firefox 3.6)
I attempted to add an image using Chrome browser and had the same issue.
I attempted to add an image using Safari, and found that the visual editor doesn't display at all, and pressing any of the media buttons causes the media browser to open in the main browser window instead of Thickbox pop-up.
I'd love to have a solution so I can use the media browser and insert images into my WYSIWYG fields!