Yesterday we released Commerce 0.8, which unfortunately introduced a problem with the checkout getting stuck in a redirect loop.
Commerce 0.8.1 is now available and fixes that, as well as adding a check to make sure a proper weight object is returned by $product->getWeight().
Changelog
- Fix Address step missing in Standard checkout process, causing infinite redirects [S12225]
- Check if comProduct->getWeight returns a PhpUnitsOfMeasure\PhysicalQuantity\Mass instance [S12225]