Thanks John for your comments - I updated the package accordingly and uploaded it to mentors.
On Sat, 05 Dec 2020 10:36:09 -0500 John Scott <jsc...@posteo.net> wrote: > I don't know if this was introduced in the new version, but the effects like > 'on fire effect' don't work for me, not even when saving as a PNG, but it's > less clear why. Did you try drag and drop the images e.g. to libreoffice impress? Via drag and drop I get the correct effects, but not via save. I reported this behavior upstream: https://github.com/klatexformula/klatexformula/issues/55
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