Are you still having this problem from earlier today?
"...as soon as I play the program video
shortly a blue highlight covers the video itself..."
If so, I wouldn't trust anything your video card is showing you.
Are you monitoring your output on an external monitor?
This is making for hard color correcting.
You can't use a computer monitor of software player for CC work anyway. You need to be sure you're seeing the signal accurately, and for that you need to get the signal off the computer and onto a properly calibrated TV.