My bad i assumed it was VaM related, but it looks like you have system based issue.
Windows updater can also install graphics/display drivers...maybe something changed or failed to auto-configure.
Did you check that windows display settings & driver settings are correct (resolution, aspect, scaling, screen size, etc...)?
If you have multi-displays, did you re-check settings on graphics driver (for each output)?
Maybe try to update/reinstall/downgrade graphics driver?
Did you try uninstalling tv driver & reconnecting?
If it's windows 11, that sh%t is bound to have issues (it's been ~4 months since launch, still not mature enough, give it a year or so).