diff --git a/coolant_control.c b/coolant_control.c
index 9d66c50..60cbf2f 100644
--- a/coolant_control.c
+++ b/coolant_control.c
@@ -45,7 +45,7 @@ void coolant_stop()
 
 void coolant_run(uint8_t mode)
 {
-  if (sys.state != STATE_CHECK_MODE) { return; }
+  if (sys.state == STATE_CHECK_MODE) { return; }
   
   protocol_buffer_synchronize(); // Ensure coolant turns on when specified in program.
   if (mode == COOLANT_FLOOD_ENABLE) {
diff --git a/motion_control.c b/motion_control.c
index 321dfe9..adc4a73 100644
--- a/motion_control.c
+++ b/motion_control.c
@@ -214,7 +214,7 @@ void mc_arc(float *position, float *target, float *offset, float radius, float f
 // Execute dwell in seconds.
 void mc_dwell(float seconds) 
 {
-   if (sys.state != STATE_CHECK_MODE) { return; }
+   if (sys.state == STATE_CHECK_MODE) { return; }
    
    uint16_t i = floor(1000/DWELL_TIME_STEP*seconds);
    protocol_buffer_synchronize();
diff --git a/settings.h b/settings.h
index a22e358..0be1035 100644
--- a/settings.h
+++ b/settings.h
@@ -26,7 +26,7 @@
 
 
 #define GRBL_VERSION "0.9e"
-#define GRBL_VERSION_BUILD "20140525"
+#define GRBL_VERSION_BUILD "20140529"
 
 // Version of the EEPROM data. Will be used to migrate existing data from older versions of Grbl
 // when firmware is upgraded. Always stored in byte 0 of eeprom
diff --git a/spindle_control.c b/spindle_control.c
index b7dd36e..0ebfa85 100644
--- a/spindle_control.c
+++ b/spindle_control.c
@@ -57,7 +57,7 @@ void spindle_stop()
 
 void spindle_run(uint8_t direction, float rpm) 
 {
-  if (sys.state != STATE_CHECK_MODE) { return; }
+  if (sys.state == STATE_CHECK_MODE) { return; }
   
   // Empty planner buffer to ensure spindle is set when programmed.
   protocol_buffer_synchronize();