I have installed the latest 1.3.1 version on a development server. I created a product and am getting stuck on the checkout.
1. I am entering a valid phone number but the non-verbose JavaScript does not tell me the proper format, assuming that this is the issue.
2. There is no way to make the phone number, optional. I could care less about getting a phone number. I do believe in past versions, it was optional. With this new version and various bug fixes and upgrades, the checkout should be a part of Settings, so that it can be customized for your store.