Since my ride yesterday my Bolt V2 shows the current speed field in black. This used to be in white like all the other fields.
When looking at the fields in the app
I can now only find current speed (compared to activity/lap) and not a plain current speed field.
I use Current Speed (vs workout avg). I’m not sure why it is showing as black though. It’s like you have partial dark mode. Have you tried toggling dark mode off/on? To do that, you do that on the device itself, press the left button, go to settings, display mode then toggle on/off and see if that changes the display back. Also, be sure you have the latest firmware for the BOLT as well as the most recent Companion App.
For some reason the speed field seems to use the opposite of the device settings, I tried the things you’ve mentioned (everything is updated) and changing back and forth to dark mode didn’t fix it but while in dark mode the speed fields turns light again.