1.8.6 introduces a .timestamp style that doesn't work well with black backgrounds.
This is what we get now:
This is what we had before the change
We need a way to control this, or the style need to inherit the style.
Timestamp background color white
ANSIColor plugin leaks format onto next line's timestamp
I've modified the configuration of the Time Formats to '<span style="color: #b5c4d0;background-color: #393939;"><b>'M/d HH:mm:ss.SSS' </b></span>' and that works as a way to get things back to what they were for us. But it isn't a great solution.
Thanks for reporting.