signed/unsigned fixes.

Marlin/Configuration_adv.h

 
 
 #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
-#define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // no z because of layer shift.
+#define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.
 
 // The hardware watchdog should reset the Microcontroller disabling all outputs, in case the firmware gets stuck and doesn't do temperature regulation.
 //#define USE_WATCHDOG
 // If you have a watchdog reboot in an ArduinoMega2560 then the device will hang forever, as a watchdog reset will leave the watchdog on.
 // The "WATCHDOG_RESET_MANUAL" goes around this by not using the hardware reset.
 //  However, THIS FEATURE IS UNSAFE!, as it will only work if interrupts are disabled. And the code could hang in an interrupt routine with interrupts disabled.
-#define WATCHDOG_RESET_MANUAL
+//#define WATCHDOG_RESET_MANUAL
 #endif
 
 // extruder advance constant (s2/mm3)

Marlin/ultralcd.cpp

 
 
 #ifdef NEWPANEL
- static long blocking=0;
+ static unsigned long blocking=0;
 #else
- static long blocking[8]={0,0,0,0,0,0,0,0};
+ static unsigned long blocking[8]={0,0,0,0,0,0,0,0};
 #endif
  
 static MainMenu menu;
     //static long previous_lcdinit=0;
   //  buttons_check(); // Done in temperature interrupt
     //previous_millis_buttons=millis();
-    long ms=millis();
+    unsigned long ms=millis();
     for(int8_t i=0; i<8; i++) {
       #ifndef NEWPANEL
       if((blocking[i]>ms))
           card.getfilename(i-FIRSTITEM);
           if(card.filenameIsDir)
           {
-            for(int8_t i=0;i<strlen(card.filename);i++)
+            for(uint8_t i=0;i<strlen(card.filename);i++)
               card.filename[i]=tolower(card.filename[i]);
             card.chdir(card.filename);
             lineoffset=0;
           else
           {
             char cmd[30];
-            for(int8_t i=0;i<strlen(card.filename);i++)
+            for(uint8_t i=0;i<strlen(card.filename);i++)
               card.filename[i]=tolower(card.filename[i]);
             sprintf(cmd,"M23 %s",card.filename);
             //sprintf(cmd,"M115");
 void MainMenu::update()
 {
   static MainStatus oldstatus=Main_Menu;  //init automatically causes foce_lcd_update=true
-  static long timeoutToStatus=0;
+  static unsigned long timeoutToStatus=0;
   static bool oldcardstatus=false;
   #ifdef CARDINSERTED
     if((CARDINSERTED != oldcardstatus))