ProSites: Membership renewal not possible + Design issues

Dear WPMU Dev Team,

today a customer tried to renew the membership for another year, it was not possible. The following problems arose - please refer also to the screenshot in the attachment:

1. It is not possible to select any of the levels
2. The Coupon Code link disappeared form the renewal page
3. The payment buttons don't show anymore correctly, previously they did
4. The background of the renewal page is now dark grey, previously it was white, which makes it extremely difficult to read the text.

Would you please provide guidance on what we need to do to solve these problems?

Thank you
With kind regards