We recently upgraded our OD V6 application to OD V7. At the same time we upgraded our Tomcat instance from 6.0.37 to 7.0.81. After the upgrade we intermittently see an application fail and java exception reporting: "Next servlet not provided in subflow exit point map for return node.". Has anyone else run into this condition?

There are many existing posts on this error. It's has different root causes. All in all, the error means it can't find the next servlet in the subflow's return node. I don't know how it happens in your case. You may want to play around the connection between any subflow node and the next servlet it's pointing. If it happen intermittently, it might have something to do with custom logic.