Cannot license images with purchased credits nor search

Hello, I have been using AdobeStock with credits for years without any problems. In January, I purchased 5 credits. Shortly after the purchase, I could no longer view any images—neither from the collections nor from my libraries. I kept getting a 404 error. After calling international support, it worked again. Now, a month later, I want to license an image. Unfortunately, I'm getting the 404 error again. I can't search by terms or image numbers. Not even in my libraries…

The support made me deleting my browser cache and checked the certificates, but nothing worked. 

I can't see a single image from the entire Adobe Stock collection. Support is overwhelmed by this issue. Since this problem has obviously occurred before, there must be a solution.

Any help appreciated…

Antje