subscriptions de-activating on upgrade to Membership 2

Since upgrading to Membership 2 pro, many of my subscriptions have been de-activating even though they're paid up in Paypal. It looks like PayPal Express is no longer a payment gateway and that might be the issue. But I'd prefer not to have to cancel each recurring payment, manually activate each subscription, then ask them to resubscribe once their membership is expired.

Any help?