> 1. In the preview window black comes up as transparent, so the underlying
> windows are visible. That is of course anoying.

	Which version of POV-Ray are you using?  If 3.6.x, are you talking about
the background color of the preview display or any black pixel in the rendered
image?

> 2. The shell script allscene.sh aborts with a lot of error messages:
>
> test: 67: ==: unexpected operator

	The "==" is unfortunately specific to bash (bashism) and should not
be used in here.  This problem has been reported recently for the POV-Ray
package in Debian (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=489644).
The workaround is to edit the faulty shell script(s) and replace the double
equal sign by a single one, i.e. "==" becomes "=" (without quotes).

	- NC

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