diff --git a/src/octoprint/plugins/svgtogcode/static/js/working_area.js b/src/octoprint/plugins/svgtogcode/static/js/working_area.js
index 8c320b95..032b1897 100644
--- a/src/octoprint/plugins/svgtogcode/static/js/working_area.js
+++ b/src/octoprint/plugins/svgtogcode/static/js/working_area.js
@@ -132,14 +132,9 @@ $(function(){
 		};
 
 		self.getXYCoord = function(evt){
-			if(isFirefox) {
-				var scale = evt.target.parentElement.transform.baseVal[0].matrix.a;
-				var x = self.px2mm(evt.offsetX) * scale;
-				var y = self.px2mm(parseFloat(evt.target.attributes.height.value) - evt.offsetY) * scale;
-			} else {
-				var x = self.px2mm(evt.offsetX);
-				var y = self.px2mm(evt.target.ownerSVGElement.getBoundingClientRect().height - evt.offsetY); // hopefully this works across browsers
-			}
+			var scale = evt.target.parentElement.transform.baseVal[0].matrix.a;
+			var x = self.px2mm(evt.offsetX) * scale;
+			var y = self.px2mm(parseFloat(evt.target.attributes.height.value) - evt.offsetY) * scale;
 			x = Math.min(x, self.workingAreaWidthMM());
 			y = Math.min(y, self.workingAreaHeightMM());
 			return {x:x, y:y};
diff --git a/src/octoprint/util/comm_acc2.py b/src/octoprint/util/comm_acc2.py
index 5581ddca..609b9ef8 100644
--- a/src/octoprint/util/comm_acc2.py
+++ b/src/octoprint/util/comm_acc2.py
@@ -88,7 +88,7 @@ class MachineCom(object):
 		self._finished_passes = 0
 
 		# regular expressions
-		self._regex_command = re.compile("^\s*\$?([GM]\d+|[TH])")
+		self._regex_command = re.compile("^\s*\$?([GM]\d+|[THX])")
 		self._regex_feedrate = re.compile("F\d+", re.IGNORECASE)
 		self._regex_intensity = re.compile("S\d+", re.IGNORECASE)
 
@@ -147,7 +147,7 @@ class MachineCom(object):
 				elif line.startswith('['): # feedback message
 					self._handle_feedback_message(line)
 				elif line.startswith('Grb'): # Grbl startup message
-					self._handle_startup_message()
+					self._handle_startup_message(line)
 			except:
 				self._logger.exception("Something crashed inside the monitoring loop, please report this to Mr. Beam")
 				errorMsg = "See octoprint.log for details"
@@ -405,7 +405,7 @@ class MachineCom(object):
 		elif line[1:].startswith('Dis'): # [Disabled]
 			pass
 
-	def _handle_startup_message(self):
+	def _handle_startup_message(self, line):
 		if self.isOperational():
 			errorMsg = "Machine reset."
 			self._cmd = None
@@ -420,7 +420,14 @@ class MachineCom(object):
 			self._changeState(self.STATE_LOCKED)
 			eventManager().fire(Events.ERROR, {"error": self.getErrorString()})
 		else:
-			self._onConnected(self.STATE_LOCKED)
+			versionMatch = re.search("Grbl (?P<grbl>.+?)(_(?P<git>[0-9a-f]{7})(?P<dirty>-dirty)?)? \[.+\]", line)
+			if versionMatch:
+				versionDict = versionMatch.groupdict()
+				self._writeGrblVersionToFile(versionDict)
+				if self._compareGrblVersion(versionDict) is False:
+					self._flashGrbl()
+				else:
+					self._onConnected(self.STATE_LOCKED)
 
 	def _update_grbl_pos(self, line):
 		# line example:
@@ -611,7 +618,7 @@ class MachineCom(object):
 		params = ["avrdude", "-patmega328p", "-carduino", "-b" + str(self._baudrate), "-P" + str(self._port), "-D", "-Uflash:w:" + pathToGrblHex]
 		rc = subprocesscall(params)
 
-		if rc is False:
+		if rc == 0:
 			self._log("successfully flashed new grbl version")
 			self._openSerial()
 			self._changeState(self.STATE_CONNECTING)
@@ -748,6 +755,10 @@ class MachineCom(object):
 		self._changeState(self.STATE_HOMING)
 		return cmd
 
+	def _gcode_X_sent(self, cmd, cmd_type=None):
+		self._changeState(self.STATE_HOMING) # TODO: maybe change to seperate $X mode
+		return cmd
+
 	def _gcode_Hold_sent(self, cmd, cmd_type=None):
 		self._changeState(self.STATE_PAUSED)
 		return cmd
@@ -1275,6 +1286,7 @@ def serialList():
 	baselist = baselist \
 				+ glob.glob("/dev/ttyUSB*") \
 				+ glob.glob("/dev/ttyACM*") \
+				+ glob.glob("/dev/ttyAMA*") \
 				+ glob.glob("/dev/tty.usb*") \
 				+ glob.glob("/dev/cu.*") \
 				+ glob.glob("/dev/cuaU*") \