diff --git a/binary/log.go b/binary/log.go
index cc6c6372..9eacec2a 100644
--- a/binary/log.go
+++ b/binary/log.go
@@ -11,8 +11,8 @@ var log = log15.New("module", "binary")
 func init() {
 	log.SetHandler(
 		log15.LvlFilterHandler(
-			log15.LvlWarn,
-			//log15.LvlDebug,
+			//log15.LvlWarn,
+			log15.LvlDebug,
 			log15.StreamHandler(os.Stderr, log15.LogfmtFormat()),
 		),
 	)
diff --git a/binary/reflect.go b/binary/reflect.go
index e2982ea0..f93d5d81 100644
--- a/binary/reflect.go
+++ b/binary/reflect.go
@@ -90,7 +90,19 @@ func readReflect(rv reflect.Value, rt reflect.Type, r Unreader, n *int64, err *e
 
 	log.Debug("Read reflect", "type", rt)
 
-	// First, create a new struct if rv is nil pointer.
+	// Get typeInfo
+	typeInfo := GetTypeInfo(rt)
+
+	// Custom decoder
+	if typeInfo.Decoder != nil {
+		decoded := typeInfo.Decoder(r, n, err)
+		//decodedRv := reflect.Indirect(reflect.ValueOf(decoded))
+		//rv.Set(decodedRv)
+		rv.Set(reflect.ValueOf(decoded))
+		return
+	}
+
+	// Create a new struct if rv is nil pointer.
 	if rt.Kind() == reflect.Ptr && rv.IsNil() {
 		newRv := reflect.New(rt.Elem())
 		rv.Set(newRv)
@@ -103,17 +115,6 @@ func readReflect(rv reflect.Value, rt reflect.Type, r Unreader, n *int64, err *e
 		rv, rt = rv.Elem(), rt.Elem()
 	}
 
-	// Get typeInfo
-	typeInfo := GetTypeInfo(rt)
-
-	// Custom decoder
-	if typeInfo.Decoder != nil {
-		decoded := typeInfo.Decoder(r, n, err)
-		decodedRv := reflect.Indirect(reflect.ValueOf(decoded))
-		rv.Set(decodedRv)
-		return
-	}
-
 	// Read TypeByte prefix
 	if typeInfo.HasTypeByte {
 		typeByte := ReadByte(r, n, err)
diff --git a/cmd/daemon.go b/cmd/daemon.go
index 4246006f..e2359dc7 100644
--- a/cmd/daemon.go
+++ b/cmd/daemon.go
@@ -50,7 +50,7 @@ func NewNode() *Node {
 	pexReactor := p2p.NewPEXReactor(book)
 
 	// Get MempoolReactor
-	mempool := mempool_.NewMempool(state)
+	mempool := mempool_.NewMempool(state.Copy())
 	mempoolReactor := mempool_.NewMempoolReactor(mempool)
 
 	// Get ConsensusReactor
diff --git a/cmd/gen_tx.go b/cmd/gen_tx.go
index cfc2e219..a99f44c8 100644
--- a/cmd/gen_tx.go
+++ b/cmd/gen_tx.go
@@ -119,6 +119,6 @@ func gen_tx() {
 	}
 
 	// Sign
-	tx.Inputs[0].Signature = srcPrivKey.Sign(binary.BinaryBytes(tx))
+	tx.Inputs[0].Signature = srcPrivKey.Sign(account_.SignBytes(tx))
 	fmt.Printf("Signed tx: %X\n", binary.BinaryBytes(tx))
 }
diff --git a/rpc/http_handler.go b/rpc/http_handler.go
index 25adbc11..ba25e5a7 100644
--- a/rpc/http_handler.go
+++ b/rpc/http_handler.go
@@ -96,7 +96,7 @@ func RecoverAndLogHandler(handler http.Handler) http.Handler {
 					// For the rest,
 					rww.WriteHeader(http.StatusInternalServerError)
 					rww.Write([]byte("Internal Server Error"))
-					log.Error("Panic in HTTP handler", "error", e, "stack", debug.Stack())
+					log.Error("Panic in HTTP handler", "error", e, "stack", string(debug.Stack()))
 				}
 			}
 
diff --git a/rpc/mempool.go b/rpc/mempool.go
index 6b6ce6c8..82d0d5ff 100644
--- a/rpc/mempool.go
+++ b/rpc/mempool.go
@@ -17,10 +17,12 @@ func MempoolHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	reader, n := bytes.NewReader(txBytes), new(int64)
-	tx := block.TxDecoder(reader, n, &err).(block.Tx)
+	tx_ := block.TxDecoder(reader, n, &err)
 	if err != nil {
 		ReturnJSON(API_INVALID_PARAM, Fmt("Invalid tx_bytes: %v", err))
 	}
+	// XXX Oops, I need to cast later like this, everywhere.
+	tx := tx_.(block.Tx)
 
 	err = mempoolReactor.BroadcastTx(tx)
 	if err != nil {
@@ -31,6 +33,5 @@ func MempoolHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 /*
-curl --data 'tx_bytes=0101146070FF17C39B2B0A64CA2BC431328037FA0F476064000000000000000001407D28F5CEE2065FCB2952CA9B99E9F9855E992B0FA5862442F582F2A84C3B3B31154A86D54DD548AFF080697BDC15AF26E68416AA678EF29449BB8D273B73320502206BD490C212E701A2136EEEA04F06FA4F287EE47E2B7A9B5D62EDD84CD6AD975301146070FF17C39B2B0A64CA2BC431328037FA0F47606400000000000000' -H 'content-type: text/plain;' http://127.0.0.1:8888/mempool
-tx: 0101146070FF17C39B2B0A64CA2BC431328037FA0F476064000000000000000001407D28F5CEE2065FCB2952CA9B99E9F9855E992B0FA5862442F582F2A84C3B3B31154A86D54DD548AFF080697BDC15AF26E68416AA678EF29449BB8D273B73320502206BD490C212E701A2136EEEA04F06FA4F287EE47E2B7A9B5D62EDD84CD6AD975301146070FF17C39B2B0A64CA2BC431328037FA0F47606400000000000000
+curl -H 'content-type: text/plain;' http://127.0.0.1:8888/mempool?tx_bytes=0101146070FF17C39B2B0A64CA2BC431328037FA0F47606400000000000000000140D209A7CD4E2E7C5E4B17815AB93029960AF66D3428DE7B085EBDBACD84A31F58562EFF0AC4EC7151B071DE82417110C94FFEE862A3740624D7A8C1874AFCF50402206BD490C212E701A2136EEEA04F06FA4F287EE47E2B7A9B5D62EDD84CD6AD975301146070FF17C39B2B0A64CA2BC431328037FA0F47FF6400000000000000
 */
diff --git a/state/genesis.go b/state/genesis.go
index cadc1a69..aac4d0ca 100644
--- a/state/genesis.go
+++ b/state/genesis.go
@@ -117,6 +117,10 @@ func MakeGenesisState(db db_.DB, genDoc *GenesisDoc) *State {
 		}
 	}
 
+	// IAVLTrees must be persisted before copy operations.
+	accounts.Save()
+	validatorInfos.Save()
+
 	return &State{
 		DB:                  db,
 		LastBlockHeight:     0,
diff --git a/state/test.go b/state/test.go
index 2994082d..8f9ea847 100644
--- a/state/test.go
+++ b/state/test.go
@@ -2,7 +2,7 @@ package state
 
 import (
 	"bytes"
-	"encoding/base64"
+	"encoding/hex"
 	"sort"
 
 	. "github.com/tendermint/tendermint/account"
@@ -65,7 +65,7 @@ func RandGenesisState(numAccounts int, randBalance bool, minBalance uint64, numV
 	for i := 0; i < numAccounts; i++ {
 		account, privAccount := RandAccount(randBalance, minBalance)
 		accounts[i] = GenesisAccount{
-			Address: base64.StdEncoding.EncodeToString(account.Address),
+			Address: hex.EncodeToString(account.Address),
 			Amount:  account.Balance,
 		}
 		privAccounts[i] = privAccount
@@ -75,11 +75,11 @@ func RandGenesisState(numAccounts int, randBalance bool, minBalance uint64, numV
 	for i := 0; i < numValidators; i++ {
 		valInfo, privVal := RandValidator(randBonded, minBonded)
 		validators[i] = GenesisValidator{
-			PubKey: base64.StdEncoding.EncodeToString(BinaryBytes(valInfo.PubKey)),
+			PubKey: hex.EncodeToString(BinaryBytes(valInfo.PubKey)),
 			Amount: valInfo.FirstBondAmount,
 			UnbondTo: []GenesisAccount{
 				{
-					Address: base64.StdEncoding.EncodeToString(valInfo.PubKey.Address()),
+					Address: hex.EncodeToString(valInfo.PubKey.Address()),
 					Amount:  valInfo.FirstBondAmount,
 				},
 			},