white screen after changes in t3 with bs3

Hi
when i install T3 with bs3 RC
and i make changes in the template less folder i got after that a white screen and can not change that anymore i have to make a complete new install from joomla

use
joomla 3.2
with t3 template with bs3 release rc from 30-11-2013

ps how to use gradient in the body now

regards

Gerhard