I ran your scene animation to 24 frames, no problems.
You need to state your OS (likewise POV platform)  and other relevent info, 
like video, ram, etc.; esp. since you've posted to the bugreports group.

Message <36604538.0@news.povray.org>, Guy Giesbrecht  typed...
>
>Hi anyone,
>          I've been using pov-ray for a couple years now with great
>satisfaction, until I recently downloaded version 3.1 and began a new
>project with hopes of rendering a simple flower like shape. I began with a
>primitive, just to get the feel. But when I try to animate the primitives
>motion using the clock variable I always get a page fault error which closes
>the application.
>         Here's the problem causing code:
>
>global_settings { assumed_gamma 1.0 }
>#include "colors.inc"
>// ------------------------------------------------------------------
>// Look down at an angle at our creation
>camera
>{ 
>  location  <0,1,-4.0>
>  direction 1*z
>  look_at   <0,0,0>
>} 
>
>
>// ------------------------------------------------------------------
>// Simple background for a simple scene
>background { color rgb <0.9, 0.8, 0.7> }
>
>
>// ------------------------------------------------------------------
>// A light source
>light_source { <20, 20, -10>  color White  }
>#declare increment = 0.03;
>#declare xd=0.0;
>#declare yd=-2.0;
>#declare zd=0.0;
>#declare dd = 0.12;  
>
>#declare iclock=clock+0.01; 
>#declare fclock=5.0*(clock+0.01);
>#declare tclock=2.0*(clock+0.01);
>#declare td=3.5;
>blob{
>threshold 0.6
>#while (yd<=1)
>#declare td=td-0.014;
>#declare xd=sin(yd*3.0+fclock)/td;
>// #declare zd=sin(yd*2+tclock);
>  cylinder { <xd,yd,zd>  <xd,yd+0.03,zd>, dd , 4 pigment { Red } }
>  #declare yd=yd+increment;
>  #declare dd=dd-0.0009;  
>
>#end
>sphere { <xd,yd+increment+.15,zd> ,.5,7
>// image_map { tga "eye1.tga" }  rotate <0,-139.2,4+fclock> rotate <-70,0,0> 
scale 4 
>texture { pigment { Blue  } finish { roughness 0.3 } }
>  }
>}
>
>    This runs fine for between 2 and 10 renderings, then it throuws a page 
fault
> error and an Access Violation 0xc0000005,  the debugger points out this bit 
of 
>native code as the problem:
>
>00439E7D   add         esi,48h
>00439E80   push        edi
>00439E81   mov         eax,ecx
>00439E83   shr         ecx,2
>
>00439E86   repne movs  dword ptr es:[edi],dword ptr [es
>i
>]
>
>0
>0439E88   mov         cl,al
>00439E8A   and         cl,3
>00439E8D   repne movs  byte ptr es:[edi],byte ptr [esi]
>
>         The line seperated by spaces is the one pointed to as the error
>line.
>
>        Does anyone know how to prevent this? am I missing something in the
>coding?
>        Any help would be greatly appreciated.
>          Thanks,
>            Guy :)E
>
>
>
>
>
>
>
>
>
>

-- 
 omniVERSE: beyond the universe
  http://members.aol.com/inversez/POVring.html
=Bob

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