Am 13.06.2017 um 18:22 schrieb Bald Eagle:
> Running 3.7.1-beta.2

As a beta tester, please assist us developers in focusing our time and
energy on improvements and unfixed bugs (rather than hunting ghosts) by
updating your version of POV-Ray on a regular basis - or at least
whenever you encounter a bug.

I strongly suspect that the issue you're observing is fixed in the
newest beta. To quote from the revision history (`changes.txt`):

--------------------------------------------------------------------
Changes between 3.7.1-beta.5 and 3.7.1-beta.6
=============================================

[...]

Fixed or Mitigated Bugs
-----------------------

[...]

Reported via the Newsgroups:

    [...]
  - <web.58e39b3f29046ace8464b730@news.povray.org>
    (2017-04-04, povray.beta-test, "Re-Render of Editor-Bitmaps failed
    with Beta 5 ?")
    Command-line-style switches with optional parameters (e.g. `-jN`)
    are not accepted in INI files if the parameter is omitted
    (e.g. `-j`).
--------------------------------------------------------------------
[text reformatted to fit the message width]

As the `-a` switch has an optional parameter (namely the anti-aliasing
quality setting; the value will be used if you later specify `+a`
without a parameter), it is presumably among the set of switches
affected by that fixed issue.


Your aperture science development team thanks you for helping us help
you help us all. :)

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