Strange behavior pinMode/digitalWrite within library

Hello,

I've done a TIVA C-123-Launchpad conversation of Henning Karlsen's LCD5510 library (it's much the same as the UTFT library).

Everything is working, BUT:

I've to eliminate following code (commented out part) in the *.cpp file, and I've to do it manually in "setup" sketch:

LCD5110::LCD5110(int SCK, int MOSI, int DC, int RST, int CS)
{
	P_SCK	= portOutputRegister(digitalPinToPort(SCK));
	B_SCK	= digitalPinToBitMask(SCK);
	P_MOSI	= portOutputRegister(digitalPinToPort(MOSI));
	B_MOSI	= digitalPinToBitMask(MOSI);
	P_DC	= portOutputRegister(digitalPinToPort(DC));
	B_DC	= digitalPinToBitMask(DC);
	P_RST	= portOutputRegister(digitalPinToPort(RST));
	B_RST	= digitalPinToBitMask(RST);
	P_CS	= portOutputRegister(digitalPinToPort(CS));
	B_CS	= digitalPinToBitMask(CS);
    
    /*
	pinMode(_SCK,OUTPUT);
	pinMode(_MOSI,OUTPUT);
	pinMode(_DC,OUTPUT);
	pinMode(_RST,OUTPUT);
	pinMode(_CS,OUTPUT);
    */
	SCK_Pin=SCK;
	RST_Pin=RST;
    
}

If I leave this in the library, compiling is ok, but the TIVA freezes. I've compared it with the tiva conversation of the UTFT library line for line and I'm at a loss with this stupid easy code

I've attached the whole conversation of the basic and graph library.

Little example code (working):

// LCD5110_Sleep_Mode (C)2014 Henning Karlsen
// web: http://www.henningkarlsen.com/electronics
//
// This program is a demo of sleep mode.
//
// This program requires a Nokia 5110 LCD module.
//
// It is assumed that the LCD module is connected to
// the following pins using a levelshifter to get the
// correct voltage to the module.
//      SCK  - Pin 8
//      MOSI - Pin 9
//      DC   - Pin 10
//      RST  - Pin 11
//      CS   - Pin 12
//
#include <LCD5110_Basic.h>
LCD5110 myGLCD(PA_2,PA_3,PA_4,PB_6,PB_7);
extern uint8_t SmallFont[];
extern uint8_t MediumNumbers[];

void setup()
{
  pinMode(PA_2,OUTPUT);
	pinMode(PA_3,OUTPUT);
	pinMode(PA_4,OUTPUT);
	pinMode(PB_6,OUTPUT);
	pinMode(PB_7,OUTPUT);
  myGLCD.InitLCD();
}

void loop()
{
  myGLCD.setFont(SmallFont);
  myGLCD.clrScr();
  myGLCD.print("Entering", CENTER, 0);
  myGLCD.print("Sleep Mode", CENTER, 8);
  myGLCD.print("in", CENTER, 16);
  myGLCD.print("Seconds", CENTER, 40);
  myGLCD.setFont(MediumNumbers);
  for (int s=10; s>=0; s--)
  {
    myGLCD.printNumI(s, CENTER, 24, 2, '0');
    delay(1000);
  }
  myGLCD.enableSleep();
  delay(5000);
  myGLCD.disableSleep();
  myGLCD.setFont(SmallFont);
  myGLCD.print("Awake again!", CENTER, 0);
  myGLCD.print("The screen was", CENTER, 16);
  myGLCD.print("cleared while", CENTER, 24);
  myGLCD.print("in Sleep Mode.", CENTER, 32);
  delay(5000);
}
 

Thanks 

Matthias