Have reviewed your install. You've a broken database entry in the _cbsubs_gateway_accounts database table. I've no idea how though. I've patch core CB so you can see this in CBSubs > Gateways. It has no id, name, etc.. Please delete the broken entry manually within the database table _cbsubs_gateway_accounts using phpmyadmin. That will fix your issue with accessing CBSubs > Gateways. Not really sure how that was even possible to accomplish as the id column is auto incrementing.
As for Stripe not working it's because of "Stripe.js must be loaded from js.stripe.com. For more information" error. You're using JCH Optimizer, which is bundling the Stripe external script. Stripe does not allow this for security reasons. I've adjusted your JCH Optimizer settings to stop trying to optimize external resources and confirmed Stripe now works fine. Please be careful with optimizers like this as they can sometimes break things.