this topic seems to be going through the years, but since nobody answers on the older thread, I thought to open a new one.
Despite having a working preview in the dashboard, the front end popove are white text on white background. They are ignoring every color set in the option of the individual popover.
I changed the CSS as suggested in the other thread with no effect.
You can see an update e.g. here
I brings the popup white on white, despite surely that the option "use individual color" is checked in the color for text is black.
As said, when looking at the preview it shows correct.