[Plugin: NextGEN Gallery] upload not working

Hi,

I´m using WP 2.8.4 DE with NextGen 1.3.6 – worked fine until I changed the use of the dashboard through https. Since then image upload is NOT working through the NextGen Gallery. Upload with WP Mediathek is ok.

When I try to upload an image with NextGen in to a gallery first it seems to load (red progress bar says 100% loaded), but then an error message came up telling me “0 Bild(er) erfolgreich hinzugefügt” (0 images successfull added).

Doas anybody has an idea, how I could solve this problem? (Unfortunately dashboard has to be used only with https)

Thanks
Bernhard