diff --git a/js_src/Message.js b/js_src/Message.js
index dc3cab3..54c347e 100644
--- a/js_src/Message.js
+++ b/js_src/Message.js
@@ -10,7 +10,7 @@ function Message() {
 	this.$element;
 	
 	var self = this;
-	var autoHideDelay = 2000;
+	var autoHideDelay = 5000;
 	var autohideTimeout;
 	
 	this.init = function($element) {
diff --git a/js_src/Printer.js b/js_src/Printer.js
index 5cf9e78..5e245c9 100644
--- a/js_src/Printer.js
+++ b/js_src/Printer.js
@@ -46,7 +46,7 @@ function Printer() {
 	this.retryStopDelay;							// retry setTimout instance
 	this.retryPreheatDelay;						// retry setTimout instance
 	
-	this.maxGCodeSize = 10;						// max size of gcode in MB's (estimation)
+	Printer.MAX_GCODE_SIZE = 10;						// max size of gcode in MB's (estimation)
 	
 	this.stateOverruled = false;
 	
@@ -70,6 +70,13 @@ function Printer() {
 	
 	this.preheat = function() {
     console.log("Printer:preheat");
+    
+    if(	this.state == Printer.BUFFERING_STATE ||
+    		this.state == Printer.PRINTING_STATE ||
+    		this.state == Printer.STOPPING_STATE) {
+    	return;
+    }
+    
     var self = this;
     if (communicateWithWifibox) {
 	    $.ajax({
@@ -114,7 +121,8 @@ function Printer() {
     var gcodeSize = gcodeLineSize*gcode.length/1024/1024; // estimate gcode size in MB's
     console.log("  gcodeSize: ",gcodeSize);
     
-    if(gcodeSize > this.maxGCodeSize) {
+    if(gcodeSize > Printer.MAX_GCODE_SIZE) {
+    	alert("Error: Printer:print: gcode file is probably to big ("+gcodeSize+"MB) (max: "+this.maxGCodeSize+"MB)");
     	console.log("Error: Printer:print: gcode file is probably to big ("+gcodeSize+"MB) (max: "+this.maxGCodeSize+"MB)");
     	return;
     }
@@ -159,7 +167,7 @@ function Printer() {
 		          this.gcode = [];
 		          btnStop.css("display","block"); // hack
 		          self.removeLeaveWarning();
-		          message.set("Doodle is send to printer...",Message.INFO,true);
+		          message.set("Doodle is sent to printer...",Message.INFO,true);
 		          //self.targetTemperature = settings["printer.temperature"]; // slight hack
 		        } else {
 		        	// only if the state hasn't bin changed (by for example pressing stop) we send more gcode
diff --git a/js_src/SettingsWindow.js b/js_src/SettingsWindow.js
index 9eb7191..c345fcf 100644
--- a/js_src/SettingsWindow.js
+++ b/js_src/SettingsWindow.js
@@ -245,16 +245,13 @@ function SettingsWindow() {
 	}
 	this.displayValidationError = function(key,msg) {
 		var formElement = self.form.find("[name|='"+key+"']");
-		console.log("formElement: ",formElement);
 		formElement.addClass("error");
 		var errorMsg = "<p class='errorMsg'>"+msg+"</p>"
 		formElement.after(errorMsg);
 	}
 	this.clearValidationErrors = function() {
-		var formElements = self.form.find(".error");
-		formElements.each( function(index,element) {
-			$(element).removeClass("error");
-		});
+		self.form.find(".errorMsg").remove();
+		self.form.find(".error").removeClass("error");
 	}
 	
 	this.readForm = function() {
diff --git a/js_src/gcodeGenerating.js b/js_src/gcodeGenerating.js
index 8cd3a4c..ca37665 100644
--- a/js_src/gcodeGenerating.js
+++ b/js_src/gcodeGenerating.js
@@ -25,7 +25,7 @@ gcodeEnd.push("G90"); 							// absolute positioning
 gcodeEnd.push("M117 Done                ");	// display message (20 characters to clear whole screen)*/
 
 
-var MAX_POINTS_TO_PRINT = 400000; //80000; //40000; 
+var MAX_POINTS_TO_PRINT = 200000; //400000; //80000; //40000; 
 var gcode = [];
 
 function generate_gcode() {
@@ -139,9 +139,11 @@ function generate_gcode() {
 	//console.log("  pointsToPrint: ",pointsToPrint);
 	//console.log("  MAX_POINTS_TO_PRINT: ",MAX_POINTS_TO_PRINT);
   
+	console.log("pointsToPrint: ",pointsToPrint);
+		
   if(pointsToPrint > MAX_POINTS_TO_PRINT) {
   	alert("Sorry, your doodle to to complex and / or to high");
-  	console.log("WARNING: to many points to convert to gcode");
+  	console.log("ERROR: to many points to convert to gcode");
   	return [];
   }