> In the future, please check the list of known bugs before reporting them again:
>
>    o There is an issue with media and transparency. See
>      <42769324$1@news.povray.org>.
>    o The windows editor does not always detect new files as type 'povray'.
>    o In many cases speed is not as good as 3.6.
>    o Photon support is not yet completed.
>    o There are some differences in the way gamma correction works.

Are the square & line artifacts in the image a result of these known issues?
That was my main concern, not the media and transparency or photon support.

BTW, here is the missing 'proper' bug information:
POV-Ray version: 3.7.0.beta.8.icl8.win32
OS version: Windows XP SP2 UK
PC: Intel P4 2.6Ghz, 2GB RAM

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