They have most likely tried to fix your issue. If you had absolutely any idea how it is to develop software, especially a video recording one, you would understand that's there not just "one fix" for anything. They know about your issue, they have tried to provide fixes, and obviously, those don't work.
You even
said it yourself that uninstalling PhysX made you able to record.
If you want to help more, post your full computer specifications with what settings you use, OS, and all other hardware. That makes it a lot easier to troubleshoot issues.
Very strange that its "not" easy.. Other recording software, has managed to fix this. But Bandicam has not.. So it might be, that they don't want to.
And yes, uninstalling PhysX did "fix" it, but that's not a proper solution. I can't see why I need to uninstall stuff, for others to work. Don't make any sense.
This problem has NOTHING to do with my hardware. Many others have the same problem and I'm sure, they have other hardware than i do.
And Bandicam worked just fine before the latest Ghosts update. So I can't see why my hardware should be the problem.
So Bandicam, please fix this NOW, or give me my 3 license money back. Thanks