Run a "clear crypto sa" on the spoke router with NHRP, ISAKMP, and IPSEC debugs running at both ends. When the tunnel reestablishes with data, collect a "sh ip eigrp neighbor" to verify that there is a neighbor relationship for both on the hub and that there are two tunnels in the "sh cry isa sa detail" output. At the same time collect a "sh crypto session" to check the "session status" for each. It should be in an UP-ACTIVE state.