I've noticed the same thing with several versions of the Nvidia driver and a T1000 8GB card. Currently I'm on the same NVidia driver version as ~Turtle91 and I am seeing the same effects randomly.
Windows 11 Pro 23H2 22631.3527, Nvidia T1000 8GB, Sigil 2.1.0 2024.04.26
If I use Sigil in one of my VMs, I don't notice that happening which does suggest that it is video driver related.
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