Large 3D array

I am using MSP430f6638 and code composer studio 5.5.0

I created an array

char graphic_data[2][8][64];
in a program.

When i compile this program, it compiles successfully , but when i go into debug mode, the debug toolbar doesn't become active.

but when i reduce the size of the array

char graphic_data[2][8][8];

it works fine.

also in the top figure the msp430 is always running, it is never suspended.
and in the other figure the msp30 is suspended.

is there any problem with memory allocation done by compiler?
how may i fix it?