Klarna issues

[Favazza]

When activating the Klarna payment option we got a few problems:

After putting a product into the cart and then want to go to Checkout, you turn up at a internal server 500-page.
Anyone seen this?

Unfortunately Klarna doesn't support this plugin, which sets us in a weird position as we're under contract paying for the service that doens't work.

Runnin
VM2.0.20b
J2.5.9

[Favazza]

No tips on this one?