Custom Resolution Utility (CRU)

[ToastyX]

That's weird. The settings for one monitor shouldn't affect another monitor, and running reset-all.exe removes all EDID overrides, so it shouldn't be using an unsupported resolution.

The only thing I can think of is maybe the monitor's default EDID defines a resolution that the monitor doesn't actually support. Use CRU to remove all the resolutions except the native resolution, and make sure the extension block is disabled.