from www.nop-payments.com) is the issue. If I disable it, the one page checkout is fine. If I re-enable Stripe payment, the page gets an error and will not load. I set the default country to US, but that didn't fix it. Stripe payments works fine when I disable one page checkout. Is there a known fix for this by any chance?
there was indeed a problem, but it was fixed by the nop-payments develop about 3 months ago. You just need to re-download the Stripe plugin and everything will work fine.
P.S. - the version that contains the fix is Stripe_3_80_220.127.116.11 or above.
Hope this helps!