CCS/TMS320F28379D: Code runs with Debugger in RAM but not in FLASH

Tool/software: Code Composer Studio

Hi,

I use this Code to ask for a Status of an Input Pin of the Microcontroller (Launchpad). When I run it in Code Composer with the Debugger in RAM, everything works fine. But when I run it in FLASH, it does not work. What is the Problem? I used the Standard configuration of Code Composer, with Example "epwm_updown_aq_cpu01" (Configuration CPU1_FLASH and CPU1_RAM).

if(GpioDataRegs.GPADAT.bit.GPIO18 == 1)
        {

         ...
        }
        else
        {
         ....
        }

Thanks.

Benedikt