Temperamental Source Selection

I'v been using OBS for a while on a Mac and it has been rock solid. However, my experience on Windoews has been very different.

I have been trying to set up a simple scene with 2 sources (USB capture cards of a camera and a PowerPoint) and it has been incredibly flakey. Its not showing previews of the sources, I can't change scenes etc. When I close and reopen I can see what changes I have made, but I literaly have to keep closing and reopening it at every stage.

Its a brand new installation of the latest version on a fully updated Windows 11 machine. Any suggestions? Is my installation corrupt, or might it be a hardware problem? Is there something in the settings I need to change?

Any suggestions glady received.
 
Sorry, my mistake. I meant Windows 10! (I still have it on a mac as well, but for this particular job I need to use a Windows machine).
 
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