Yup I get it too:

I tried it different ways using a custom build of 3.6.0 (just a bug fix of
the "Identifier expected. - Incomplete function call or spline call found
instead" bug).  Not knowing what it'd look like and wanting to move things
along quicker I started with max_trace_level 5 and it rendered fine at the
same 1000x1000 no AA.  Then:

max_trace_level 5  & radiosity = renders fine at 1000x1000 no AA
max_trace_level 50 & radiosity = stops at 27% just like you said
(or 28% if 800x800)
max trace_level 5  no radiosity = renders fine at 1000x1000 no AA
max_trace_level 50 no radiosity = renders fine at 1000x1000 no AA

Leaving both max_trace_level at 50 and radiosity on:
500x500 stops at 27%  499^2 and 501^2 both render fine.
600^2 renders fine.  700^2 stops at 12%  699^2 stops at 28%
701^2 stops at 26% 698^2 renders fine.

700^2 renders fine with the camera moved to <5,9,11.1>

Charles

William Peska <wil### [at] yahoocom> wrote:
> global_settings {
>    assumed_gamma 1
>
>    max_trace_level 50
>    radiosity {}
> }
>
> camera{
>   location <5, 9, 11>
>   up       <0, 1, 0>
>   right    <1, 0, 0>
>   look_at  <0, -1, 0>
> }

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