I've only seen that when the external binary icon resources can't be found, or can't be loaded because they were built with an incompatible version of Qt. It can't be the latter since the same version of Qt that compiles Sigil compiles the external resources.
Look in <install_prefix>/share/sigil and see if there's an iconthemes folder there that contains .rcc files.
Last edited by DiapDealer; 11-13-2020 at 03:40 PM.
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