Double clicking the portrait does set the camera back on them. Until I move my cursor off from the portrait. It doesn't matter where on the screen my cursor is, the camera keeps flying top right.
Same is true with holding down left mouse button. The camera will follow the character, but as soon as I release the mouse button, the camera again flies top right no matter what I do.
I have also tried the resolution switching, none of them do any difference.
I'll try the windowed debug mode if nothing else will work, 'cause I don't want to have to download a 3rd party software to make this work, unless there's no other choice.
Is there anything else I can do?
