May you post step-by-step how to reproduce the bug? (all steps including right after you create new Profile and new Scene Collection, like clicking at mixer, at settings, at scenes when you hit recording button and when error rise etc.)
I just updated to 0.16.5 but that shouldn't change anything.
Step by Step Instructions:
1. Delete and Create Profile and Scene Selection to reset settings.
2. Click on File and click on Settings.
3. Click on the Video Side Tab.
4. Change Output Display Resolution to the Base Resolution.
5. Change Downscale Filter to Lanczos.
6. Change 'Common Fps Values' Value to 60.
7. Click on the Audio Side Tab.
8. Change Desktop Audio Device to Default or Speakers.
9. Change Mic/Auxiliary Audio Device to Default or Microphone.
10. Click on the Hotkeys Side Tab.
11. Change Start and Stop recording to F9.
12. Click on the Output Side Tab. Change output mode to Advanced
13. Click on the Recording Tab.
14. Change recording path a different one (2nd Internal Drive).
15. Change recording format to mp4.
16. Change encoder to NVENC H.264.
17. Change Rate Control to CQP.
18. Change CQP value to 18.
Those are all the setting I changed BEFORE it didn't work.
This is what causes the error.
19. Check the second check box in the audio track.
Here is a picture.
As soon as you click apply the "An unspecified error occurred while recording." will popup.
If you try and change it by unchecking the audio track second box it does not fix the problem.
Hopefully I haven't missed anything Suslik V.