LG Venus VX-8800

I added ringtones through bitpim and on those ringtones my phone won't vibrate and ring at the same time. I then set the ringtone to one that came with my phone and it vibrates and rings. How come it won't vibrate and ring when set to a custom ringtone. This sucks, anyone have this same problem. Also anyone figured out how to center a picture without it stretching to screen size?