[magick-users] C++ writeImages() not thread-safe?

[duc.sequere.aut.de.via.decede at imagemagick.org]

> Here is the code that I use in C++ to save the image sequence in a file

Without a stack trace it is difficult/impossible to determine what the
problem is.  The best path forward would be to create a distribution that
include a source module, build script, and any required images we could use
to reproduce the problem.  If we can reproduce the problem we generally have
a fix for it within a day or two.