well you could try aligning the text something like this:

Code:
TEXT* test_txt={
pos_x = 0;
pos_y = 0;
layer = 100;
...
}

void main(){
test_txt.pos_x = screen_size.x/2;
test_txt.pos_y = screen_size.y/2;
test_txt.flags = CENTER_X | CENTER_Y | SHOW;
...
}


With that no matter which resolution you would have th text would allways be centered on the screen.