To answer your questions:
1. Yes, I can see the green FPS numbers overlay when Bandicam has found the target process and I toggle back into the game. Also, as you mention DirectX; I already tried to update it, but when I had downloaded the installer from Microsoft and started it, I was informed that my system was already running the latest version of DirectX. So as far as I know, my DirectX is up to date.
2. No, I can't see the FPS numbers turn red when recording as I can't record to begin with.
It's very strange, because when the target process is found, the "Record" button is highlighted and I can even click it. The "pressing" animation of the button even shows, so it's as if it's reacting to my clicking it, but it's just the actual recording process that doesn't seem start for some reason.
Everything looks exactly as it did when it was working before, the only difference is that it doesn't start to record when clicking the Record button.
Also, I have tried using the record hotkey instead of clicking the record and I've also tried changing the record hotkey to something else than the default "F12" key...but the problem remains.