Quote:
Originally Posted by DiapDealer
It's probably Qt. But it sounds like it may be a case of the newer version of Qt testing the limits of your video hardware/driver (especially since it worked ok previously) on Windows. As mentioned earlier in this thread, try disabling webengine's hardware acceleration in Sigil's preferences (on Windows).
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It looks like you're correct, DiapDealer. I disabled the hardware acceleration and that helped - it removed the problem. But then I thought I'd check the drivers for any updates and I found a recent update for my Nvidia Geforce card which I downloaded and installed. After reboot and restarting Sigil with the hardware acceleration enabled again, the problem has gone away.
Looks like the driver update fixed it.