Xmind8: Hover over note, preview is black font on black background. Bug or Setting?

Hi, I have been using Xmind for some time.
On erarlier versions there were light background and dark fonts when hovering the pointer over a note. Now (Xmind8 update 9) the background has switched to almost black fonts with black background and it is impossible to read.

How can I remidy it so it gets readable? It does not matter so much what the font and background color is just so I can read it. Here is an example of how it looks when I hover over the note icon: