diff --git a/coolant_control.c b/coolant_control.c
index 3c1a681..21fc106 100644
--- a/coolant_control.c
+++ b/coolant_control.c
@@ -47,7 +47,7 @@ void coolant_run(uint8_t mode)
 {
   if (sys.state == STATE_CHECK_MODE) { return; }
 
-  protocol_auto_cycle_start();
+  protocol_auto_cycle_start();   //temp fix for M8 lockup
   protocol_buffer_synchronize(); // Ensure coolant turns on when specified in program.
   if (mode == COOLANT_FLOOD_ENABLE) {
     COOLANT_FLOOD_PORT |= (1 << COOLANT_FLOOD_BIT);
diff --git a/gcode.c b/gcode.c
index cdef3ad..65f9957 100644
--- a/gcode.c
+++ b/gcode.c
@@ -62,7 +62,7 @@ void gc_sync_position()
 {
   uint8_t i;
   for (i=0; i<N_AXIS; i++) {
-	 gc_state.position[i] = sys.position[i]/settings.steps_per_mm[i];
+     gc_state.position[i] = sys.position[i]/settings.steps_per_mm[i];
   }
 }
 
@@ -75,7 +75,7 @@ static uint8_t gc_check_same_position(float *pos_a, float *pos_b)
   }
   return(true);
 }
-
+         
 // Executes one line of 0-terminated G-Code. The line is assumed to contain only uppercase
 // characters and signed floating point values (no whitespace). Comments and block delete
 // characters have been removed. In this function, all units and positions are converted and 
diff --git a/serial.c b/serial.c
index ce67982..2ef8eda 100644
--- a/serial.c
+++ b/serial.c
@@ -178,7 +178,7 @@ ISR(SERIAL_RX)
         #endif
         
       }
-		//TODO: some sort of alarm on overflow?
+      //TODO: else alarm on overflow?
   }
 }
 
diff --git a/sim/Makefile b/sim/Makefile
index 9ec9d27..bd5db91 100644
--- a/sim/Makefile
+++ b/sim/Makefile
@@ -17,7 +17,7 @@
 
 PLATFORM   = LINUX
 
-OBJECTS    = main.o simulator.o serial.o ../main.o ../protocol.o ../planner.o ../settings.o ../print.o ../nuts_bolts.o eeprom.o ../serial.o avr/pgmspace.o avr/interrupt.o avr/io.o util/delay.o util/floatunsisf.o ../stepper.o ../gcode.o ../spindle_control.o ../motion_control.o ../limits.o ../report.o ../coolant_control.o ../probe.o ../system.o kbhit.o platform_$(PLATFORM).o
+OBJECTS    = main.o simulator.o serial.o ../main.o ../protocol.o ../planner.o ../settings.o ../print.o ../nuts_bolts.o eeprom.o ../serial.o avr/pgmspace.o avr/interrupt.o avr/io.o util/delay.o util/floatunsisf.o ../stepper.o ../gcode.o ../spindle_control.o ../motion_control.o ../limits.o ../report.o ../coolant_control.o ../probe.o ../system.o platform_$(PLATFORM).o
 CLOCK      = 16000000
 EXE_NAME   = grbl_sim.exe
 COMPILE    = $(CC) -Wall -g -DF_CPU=$(CLOCK) -include config.h -I. -DPLAT_$(PLATFORM)
diff --git a/sim/kbhit.c b/sim/kbhit.c
deleted file mode 100644
index 7fc6e9e..0000000
--- a/sim/kbhit.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <sys/types.h>
-#include <sys/time.h>
-
-#include "kbhit.h"
-
-
diff --git a/sim/serial.c b/sim/serial.c
index 293e0f8..a4418e5 100644
--- a/sim/serial.c
+++ b/sim/serial.c
@@ -26,8 +26,6 @@
 #include "simulator.h"
 #include <stdio.h>
 
-#include "kbhit.h"
-
 
 //prototypes for overridden functions
 uint8_t orig_serial_read();
diff --git a/spindle_control.c b/spindle_control.c
index f5d99cc..ee4dcb8 100644
--- a/spindle_control.c
+++ b/spindle_control.c
@@ -60,7 +60,7 @@ void spindle_run(uint8_t direction, float rpm)
   if (sys.state == STATE_CHECK_MODE) { return; }
   
   // Empty planner buffer to ensure spindle is set when programmed.
-  protocol_auto_cycle_start(); 
+  protocol_auto_cycle_start();  //temp fix for M3 lockup
   protocol_buffer_synchronize(); 
 
   // Halt or set spindle direction and rpm. 
diff --git a/stepper.c b/stepper.c
index 09d9d28..cf71d1a 100644
--- a/stepper.c
+++ b/stepper.c
@@ -76,9 +76,6 @@ typedef struct {
   #else
     uint8_t prescaler;      // Without AMASS, a prescaler is required to adjust for slow timing.
   #endif
-  #ifdef AUTO_REPORT_MOVE_DONE
-    uint8_t block_end;         //true for last segment of a block
-  #endif
 } segment_t;
 static segment_t segment_buffer[SEGMENT_BUFFER_SIZE];
 
@@ -284,7 +281,7 @@ void st_go_idle()
 // with probing and homing cycles that require true real-time positions.
 ISR(TIMER1_COMPA_vect)
 {        
-  //  TIMING_ENABLE_PORT ^= 1<<TIMING_ENABLE_BIT; // Debug: Used to time ISR
+  //  SPINDLE_ENABLE_PORT ^= 1<<SPINDLE_ENABLE_BIT; // Debug: Used to time ISR
   if (busy) { return; } // The busy-flag is used to avoid reentering this interrupt
   
   // Set the direction pins a couple of nanoseconds before we step the steppers
@@ -398,9 +395,6 @@ ISR(TIMER1_COMPA_vect)
   st.step_count--; // Decrement step events count 
   if (st.step_count == 0) {
     // Segment is complete. Discard current segment and advance segment indexing.
-	 #ifdef AUTO_REPORT_MOVE_DONE
-      sys.execute |= st.exec_segment->block_end;
-	 #endif
     st.exec_segment = NULL;
     if ( ++segment_buffer_tail == SEGMENT_BUFFER_SIZE) { segment_buffer_tail = 0; }
   }
@@ -799,14 +793,8 @@ void st_prep_buffer()
       // Normal operation. Block incomplete. Distance remaining in block to be executed.
       pl_block->millimeters = mm_remaining;      
       prep.steps_remaining = steps_remaining;  
-		#ifdef AUTO_REPORT_MOVE_DONE
-  		  prep_segment->block_end = 0;
-		#endif
     } else { 
       // End of planner block or forced-termination. No more distance to be executed.
-		#ifdef AUTO_REPORT_MOVE_DONE  
- 		  prep_segment->block_end = EXEC_STATUS_REPORT; // force move-done report
-		#endif
       if (mm_remaining > 0.0) { // At end of forced-termination.
         // Reset prep parameters for resuming and then bail.
         // NOTE: Currently only feed holds qualify for this scenario. May change with overrides.