diff --git a/cmd/gotop/main.go b/cmd/gotop/main.go
index 291179f..40b304c 100644
--- a/cmd/gotop/main.go
+++ b/cmd/gotop/main.go
@@ -335,6 +335,7 @@ func eventLoop(c gotop.Config, grid *layout.MyGrid) {
 // TODO: Abstract out the UI toolkit.  mum4k/termdash, VladimirMarkelov/clui, gcla/gowid, rivo/tview, marcusolsson/tui-go might work better for some OS/Archs. Performance/memory use comparison would be interesting.
 // TODO: all of the go vet stuff, more unit tests, benchmarks, finish remote.
 // TODO: color bars for memory, a-la bashtop
+// TODO: add verbose debugging option
 func main() {
 	// For performance testing
 	//go func() {
@@ -376,6 +377,14 @@ func run() int {
 	}
 	defer logfile.Close()
 
+	errs := devices.Startup(conf.ExtensionVars)
+	if len(errs) > 0 {
+		for _, err := range errs {
+			stderrLogger.Print(err)
+		}
+		return 1
+	}
+
 	lstream, err := getLayout(conf)
 	if err != nil {
 		stderrLogger.Print(err)
@@ -387,13 +396,6 @@ func run() int {
 		return runTests(conf)
 	}
 
-	errs := devices.Startup(conf.ExtensionVars)
-	if len(errs) > 0 {
-		for _, err := range errs {
-			stderrLogger.Print(err)
-		}
-		return 1
-	}
 	if err = ui.Init(); err != nil {
 		stderrLogger.Print(err)
 		return 1
diff --git a/devices/devices.go b/devices/devices.go
index a804fab..c3cad42 100644
--- a/devices/devices.go
+++ b/devices/devices.go
@@ -30,7 +30,10 @@ func RegisterStartup(f func(vars map[string]string) error) {
 	_startup = append(_startup, f)
 }
 
-// Called after configuration has been parsed
+// Startup is after configuration has been parsed, and provides extensions with
+// any configuration data provided by the user.  An extension's registered
+// startup function should process and populate data at least once so that the
+// widgets have a full list of sensors, for (e.g.) setting up colors.
 func Startup(vars map[string]string) []error {
 	rv := make([]error, 0)
 	for _, f := range _startup {
diff --git a/termui/linegraph.go b/termui/linegraph.go
index fd50520..55aacbd 100644
--- a/termui/linegraph.go
+++ b/termui/linegraph.go
@@ -61,6 +61,7 @@ func (self *LineGraph) Draw(buf *Buffer) {
 		seriesLineColor, ok := self.LineColors[seriesName]
 		if !ok {
 			seriesLineColor = self.DefaultLineColor
+			self.LineColors[seriesName] = seriesLineColor
 		}
 
 		// coordinates of last point