I am now trying to use this Application Verifier debugging tool, but i am stuck, first of all: it breaks the program at a line that is simple variable set line (s = 1; for example)

Secondly, now when i run this program under debugger, my program seems to have changed its behaviour: i am drawing image, and now one of the colors has changed o_O, all those parts of the image that i dont draw on, has changed the color to #CDCDCD when it should be #000000, and i already set the default color to zero, still it becomes to #CDCDCD.

How do i make any sense to this?

Here is the output AV gave me:

VERIFIER STOP 00000002: pid 0x8C0: Access violation exception. 

    14873000 : Invalid address causing the exception
    004E422C : Code address executing the invalid access
    0012EB08 : Exception record
    0012EB24 : Context record

AVRF: Noncontinuable verifier stop 00000002 encountered. Terminating process ... 
The program '[2240] test.exe: Native' has exited with code -1073741823 (0xc0000001).