Just in case someone else has changed an advanced option whilst unfamiliar with it...
I found it in AppData\Roaming\OBS\\global.ini and change Renderer= from OpenGL to Direct3D 11" worked for me in OBS 64bit
General]
Pre19Defaults=false
Pre21Defaults=false
Pre23Defaults=false
LastUpdateCheck=0
InstallGUID=e49708af9fcc9b7a55caacd6fa6aeea0f239e6de
FirstRun=true
LastVersion=402653187
[Basic]
Profile=Untitled
ProfileDir=Untitled
SceneCollection=Untitled
SceneCollectionFile=Untitled
[PropertiesWindow]
cx=720
cy=580
[BasicWindow]
geometry=AdnQywACAAAAAAGcAAAAfAAABeIAAAN8AAABpAAAAJsAAAXaAAADdAAAAAAAAAAAB4A=
DockState=AAAA/wAAAAD9AAAAAQAAAAMAAAQ3AAAApPwBAAAABvsAAAAUAHMAYwBlAG4AZQBzAEQAbwBjAGsBAAAAAAAAAMUAAACoAP////sAAAAWAHMAbwB1AHIAYwBlAHMARABvAGMAawEAAADJAAAAxAAAAKgA////+wAAABIAbQBpAHgAZQByAEQAbwBjAGsBAAABkQAAAY4AAADkAP////sAAAAeAHQAcgBhAG4AcwBpAHQAaQBvAG4AcwBEAG8AYwBrAQAAAyMAAACGAAAAhgD////7AAAAGABjAG8AbgB0AHIAbwBsAHMARABvAGMAawEAAAOtAAAAigAAAIoA////+wAAABIAcwB0AGEAdABzAEQAbwBjAGsCAAACagAAAdcAAAK8AAAAyAAABDcAAAIEAAAABAAAAAQAAAAIAAAACPwAAAAA
ExtraBrowserDocks=[]
PreviewEnabled=true
AlwaysOnTop=false
SceneDuplicationMode=true
SwapScenesMode=true
EditPropertiesMode=false
PreviewProgramMode=false
DocksLocked=false
[ScriptLogWindow]
geometry=AdnQywACAAAAAAAAAAAAAAAAAlcAAAGPAAAAAAAAAAAAAAJXAAABjwAAAAAAAAAAB4A=
so what do i do