Hi Rivinoo,
With the original lib, do you use this constructor "UTFT myGLCD(ITDB32S,38,39,40,41);" ?
Youre screen is really ITDB32S compatible ?
If it's, I think it's a timming problem.
Try this :
Edit HW_AVR_defines.h
change this line :
#define pulse_low_WR PORTG &= ~(1<<2); __asm__("nop\n\t"); __asm__("nop\n\t"); __asm__("nop\n\t"); PORTG |= (1<<2)
by it :
#define pulse_low_WR PORTG &= ~(1<<2); delayMicroseconds(1); PORTG |= (1<<2)