Hi @hannesrosen
Thanks for the report.
Once you have access to your dashboard, if you can go to WooCommerce -> Status -> Logs and view the most recent fatal-errors-xxxxx.log log file it should have an error message indicating the potential problem.
I suspect you are seeing a conflict with a plugin that is using an older version of the guzzle package.
Some extensions we’ve found that do this include:
* BackWPup
* Simple Sales Tax
We’re looking to see if we can get a fix out to work handle these asap.