diff --git a/AVRsack/ASBuilder.swift b/AVRsack/ASBuilder.swift
index 1ded38f..0dd27fc 100644
--- a/AVRsack/ASBuilder.swift
+++ b/AVRsack/ASBuilder.swift
@@ -108,7 +108,7 @@ class ASBuilder {
         let progProp    = ASHardware.instance().programmers[programmer]
         let proto       = boardProp["upload.protocol"] ?? progProp?["protocol"]
         let speed       = boardProp["upload.speed"]    ?? progProp?["speed"]
-        var args        = ["-v", "-v", "-v", "-v", "-D",
+        var args        = ["-v", "-v", "-v", 
             "-C", "/usr/local/CrossPack-AVR/etc/avrdude.conf",
             "-p", boardProp["build.mcu"]!, "-c", proto!, "-P", port,
             "-U", "flash:w:build/"+board+"/"+dir.lastPathComponent+".hex:i"]
diff --git a/AVRsack/ASProjDoc.swift b/AVRsack/ASProjDoc.swift
index fb6a9eb..a7e1709 100644
--- a/AVRsack/ASProjDoc.swift
+++ b/AVRsack/ASProjDoc.swift
@@ -40,13 +40,9 @@ class ASProjDoc: NSDocument, NSOutlineViewDelegate, NSMenuDelegate {
     var fontSize                : UInt = 12
     var themeObserver           : AnyObject?
     var serialObserver          : AnyObject?
-    var board                   = "uno"
-    var programmer              = "arduino"
-    dynamic var port            : String = "" {
-        didSet {
-            
-        }
-    }
+    dynamic var board           = "uno"
+    dynamic var programmer      = "arduino"
+    dynamic var port            : String = ""
     var recentBoards            = [String]()
     var recentProgrammers       = [String]()
     var logModified             = NSDate.distantPast() as NSDate
@@ -384,7 +380,7 @@ class ASProjDoc: NSDocument, NSOutlineViewDelegate, NSMenuDelegate {
         set (newBoard) {
             for (ident, prop) in ASHardware.instance().boards {
                 if prop["name"] == newBoard {
-                    setValue(ident, forKey: "board")
+                    board = ident
 
                     pushToFront(&recentBoards, board)
                     
@@ -414,7 +410,7 @@ class ASProjDoc: NSDocument, NSOutlineViewDelegate, NSMenuDelegate {
         set (newProg) {
             for (ident, prop) in ASHardware.instance().programmers {
                 if prop["name"] == newProg {
-                    setValue(ident, forKey:"programmer")
+                    programmer = ident
                     
                     pushToFront(&recentProgrammers, programmer)
                     
@@ -460,6 +456,9 @@ class ASProjDoc: NSDocument, NSOutlineViewDelegate, NSMenuDelegate {
             return (ASSerial.instance().ports() as NSArray).containsObject(port)
         }
     }
+    class func keyPathsForValuesAffectingHasValidPort() -> NSSet {
+        return NSSet(object: "port")
+    }
     
     var canUpload : Bool {
         get {