Since you already handled the more exotic cases, something very simple:
Are you sure this is not just a typo, maybe with upper/lowercase?
(I’m reminded of problems between case sensitive and insensitive systems
like Linux vs. MacOS that costed hours of debugging…)
Since ConTeXt doesn’t rely on external libraries, I think we can exclude
a difference in e.g. libjpeg between different Linux distributions.
A difference between GUIs or window managers is really improbable, as
apparently a difference in PDF viewers.
Hraban
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