We are actually disappointed about VM at the moment Max, and this isn't just about Klarna Checkout not working. Sorry, but that's just how it is.
Klarna Checkout isn't even activated on the new install, as we never gets into the admin on it. Is that also a PHP 5.3 issue?
Anyhow I will test different PHP versions and try to get something logged on the fresh install later or tomorrow (or weekend), at the moment it doesn't, and I actually didn't have so much time digging into it (together with being disappointed and pissed of by it).
Thank you for the new version.