Thanks for your reply,
I checked screen resolution and played around with the settings on rekordbox, but with no result. My laptop has an Intel i7-5500U with graphics Intel HD 5500, so there can’t be lack of performance here.
It really looks like a video issue, as you said, but any other feature in the program is well visible.
I’m using this feature only when I’m setting the hot cues (like drop in – drop out) in the tracks, because it helps me moving faster in the track and double checking the bars.
So it’s not that I’m desperate, but I’m missing a very simple element that could be used and make my life a little little easier.
Gabriele