Rendering Animations

I am all set to render an animation of 100 frames through 'Solidrocks'. But as soon as i click the render button, my selection of 'Active Time Segment' jumps to Single frame (in the TIME OUTPUT Dailogue in Render Setup). This is also true if i select a Range of frames.
What could be the problem ?
What am I doing wrong ?
I have never faced this in the earlier versions of Soildrocks.

Solution appreciated in advance

Thanks !!