diff --git a/src/emc/usr_intf/gremlin/gremlin.py b/src/emc/usr_intf/gremlin/gremlin.py
index 3a60f9fbc4b..8e27c558849 100755
--- a/src/emc/usr_intf/gremlin/gremlin.py
+++ b/src/emc/usr_intf/gremlin/gremlin.py
@@ -326,6 +326,7 @@ def load(self,filename = None):
             canon.parameter_file = temp_parameter
 
             unitcode = "G%d" % (20 + (s.linear_units == 1))
+            # fix Incorrect preview for arcs and absolute encoders
             initcode = "G53 G0 "
             for i in range(9):
                 if s.axis_mask & (1<<i):
@@ -336,8 +337,15 @@ def load(self,filename = None):
                         pos = s.position[i] % 360.000
                     else:
                         pos = s.position[i]
-                    position = " %s%.8f" % (axis, pos)
+                    position = "%s%.8f " % (axis, pos)
                     initcode += position
+            # To guard against incorrect preview with incomplete preambles in the gcode program
+            # we initialize with active gcodes for modal groups 2,3,4,5,6,7,8,9,10,11,12,13,14,15
+            # sorting is not necessary but helps in debugging
+            active_gcodes = s.gcodes
+            for i in (3,6,14,7,5,4,9,12,10,16,8,11,13,15):
+                if active_gcodes[i] > -1:
+                    initcode = initcode + 'G' + str(active_gcodes[i]/10) + ' '
             result, seq = self.load_preview(filename, canon, unitcode, initcode)
             if result > gcode.MIN_ERROR:
                 self.report_gcode_error(result, seq, filename)