Upload Group Avatar not working when plugin activated

When I activate RTmedia the Group Avatar upload in the Create a Group process of Buddypress does not work properly anymore. Normal profile avatar upload work fine.

This is the case:
Create group
Follow steps till Avatar
Upload Avatar (works!)
Then resize with cropping (works!)
press Crop button.
Page starts loading and stops. I see a blank screen.
URL: http://www.koipeople.com/groups/create/step/group-avatar/
If I refresh that page, only then, I get the succeed message and can continue the process.

This only happens in the Create a new Group feature. Not in Change Avatar of a personal profile page.
Does someone have clue?

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Thanks for pointing out this issue. We will check what is wrong there. It will be fixed soon.