diff --git a/config/config.go b/config/config.go
index ff06e7c..26b68ac 100644
--- a/config/config.go
+++ b/config/config.go
@@ -126,7 +126,7 @@ var (
 	databasePath       = flag.String("dbpath", "/tmp/testdb", "Path to the database.")
 	databaseBackend    = flag.String("db", "memstore", "Database Backend.")
 	replicationBackend = flag.String("replication", "single", "Replication method.")
-	host               = flag.String("host", "0.0.0.0", "Host to listen on (defaults to all).")
+	host               = flag.String("host", "127.0.0.1", "Host to listen on (defaults to all).")
 	loadSize           = flag.Int("load_size", 10000, "Size of triplesets to load")
 	port               = flag.String("port", "64210", "Port to listen on.")
 	readOnly           = flag.Bool("read_only", false, "Disable writing via HTTP.")
diff --git a/docs/Configuration.md b/docs/Configuration.md
index b464adb..4b6b898 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -39,7 +39,7 @@ All command line flags take precedence over the configuration file.
 #### **`listen_host`**
 
   * Type: String
-  * Default: "0.0.0.0"
+  * Default: "127.0.0.1"
 
   The hostname or IP address for Cayley's HTTP server to listen on. Defaults to all interfaces.
 
diff --git a/docs/Overview.md b/docs/Overview.md
index cea43c6..300d005 100644
--- a/docs/Overview.md
+++ b/docs/Overview.md
@@ -62,7 +62,7 @@ Just as before:
 And you'll see a message not unlike
 
 ```bash
-Cayley now listening on 0.0.0.0:64210
+Cayley now listening on 127.0.0.1:64210
 ```
 
 If you visit that address (often, [http://localhost:64210](http://localhost:64210)) you'll see the full web interface and also have a graph ready to serve queries via the [HTTP API](/docs/HTTP.md)
diff --git a/query/gremlin/finals.go b/query/gremlin/finals.go
index a82da13..6979e22 100644
--- a/query/gremlin/finals.go
+++ b/query/gremlin/finals.go
@@ -210,6 +210,7 @@ func runIteratorToArrayNoTags(it graph.Iterator, ses *Session, limit int) []stri
 func runIteratorWithCallback(it graph.Iterator, ses *Session, callback otto.Value, this otto.FunctionCall, limit int) {
 	count := 0
 	it, _ = it.Optimize()
+	glog.V(2).Infoln(it.DebugString(0))
 	for {
 		select {
 		case <-ses.kill:
diff --git a/query/gremlin/session.go b/query/gremlin/session.go
index 8000c17..d1c84b5 100644
--- a/query/gremlin/session.go
+++ b/query/gremlin/session.go
@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/robertkrimen/otto"
+	_ "github.com/robertkrimen/otto/underscore"
 
 	"github.com/google/cayley/graph"
 	"github.com/google/cayley/query"
@@ -93,8 +94,11 @@ func (s *Session) SendResult(r *Result) bool {
 	if s.limit >= 0 && s.limit == s.count {
 		return false
 	}
+	s.envLock.Lock()
+	kill := s.kill
+	s.envLock.Unlock()
 	select {
-	case <-s.kill:
+	case <-kill:
 		return false
 	default:
 	}
@@ -111,7 +115,6 @@ func (s *Session) SendResult(r *Result) bool {
 }
 
 func (s *Session) runUnsafe(input interface{}) (otto.Value, error) {
-	s.kill = make(chan struct{})
 	defer func() {
 		if r := recover(); r != nil {
 			if r == ErrKillTimeout {
@@ -125,25 +128,41 @@ func (s *Session) runUnsafe(input interface{}) (otto.Value, error) {
 	// Use buffered chan to prevent blocking.
 	s.env.Interrupt = make(chan func(), 1)
 
+	ready := make(chan struct{})
+	done := make(chan struct{})
 	if s.timeout >= 0 {
 		go func() {
 			time.Sleep(s.timeout)
-			close(s.kill)
-			s.envLock.Lock()
-			defer s.envLock.Unlock()
-			if s.env != nil {
-				s.env.Interrupt <- func() {
-					panic(ErrKillTimeout)
+			<-ready
+			select {
+			case <-done:
+				return
+			default:
+				close(s.kill)
+				s.envLock.Lock()
+				defer s.envLock.Unlock()
+				s.kill = nil
+				if s.env != nil {
+					s.env.Interrupt <- func() {
+						panic(ErrKillTimeout)
+					}
+					s.env = s.emptyEnv
 				}
-				s.env = s.emptyEnv
+				return
 			}
 		}()
 	}
 
 	s.envLock.Lock()
 	env := s.env
+	if s.kill == nil {
+		s.kill = make(chan struct{})
+	}
 	s.envLock.Unlock()
-	return env.Run(input)
+	close(ready)
+	out, err := env.Run(input)
+	close(done)
+	return out, err
 }
 
 func (s *Session) ExecInput(input string, out chan interface{}, limit int) {
@@ -254,8 +273,11 @@ func (s *Session) GetJson() ([]interface{}, error) {
 	if s.err != nil {
 		return nil, s.err
 	}
+	s.envLock.Lock()
+	kill := s.kill
+	s.envLock.Unlock()
 	select {
-	case <-s.kill:
+	case <-kill:
 		return nil, ErrKillTimeout
 	default:
 		return s.dataOutput, nil