White Lines Outside Screen Area with Shader?

I get an occasional white line outside the screen area on some games with a shader on. Doesn’t happen too often, but I would like to find out what causes it, so I can prevent it (probably something I did).

It’s pretty hard to see in the screenshot, but it looks like a thin line (circled) coming from the white in the game logo.

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I have some strange issues that sound similar using the Megatron shader. Only with certain masks… and it doesn’t show in a GPU or CPU screenshot… so it is something to do with my monitor. Like it is messing with my sub pixels or something else peculiar.

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It doesn’t occur often, but it’s an annoyance.

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