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I debug, test, build, and compile Sigil With Virtualbox Windows systems (Windows 7 - 10) all day everyday with no problems.
What version of Virtualbox are you using, and what version of the guest additions are you using? Which VM video driver?
In all truthfulness though, even if there is an issue with Sigil and some recent version of virtualbox, it's likely to be a compatibility issue with Qt and video drivers. Much like display issues with Sigil in some Windows 7 machines (physical), there's not much we can do to remedy that. Keeping Sigil working relatively bug-free on three physical platforms is difficult enough. A glitch in a particular virtual environment isn't going to be high on my list of things to track down, I'm afraid.
Have you searched for that custom css file in the Sigil user preferences folder like @BeckyEbook suggested?
Last edited by DiapDealer; 11-07-2020 at 10:02 AM.
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