Hi Shawn,

This is not a bug. This is because your design only partially supports the black theme.

You make use of those native Cube parameter controls to show the current real time value of those three parameters. This control supports the black theme so you should make sure your complete design supports the black theme (unless you would replace the parameter control with your own design in Visio).

How can you make your drawing compatible with the black theme?

1. Remove the grey background. You seem to have a background in a fixed color. Remove it so that you see the actual background of the Visio page. Then this background will follow the white or black theme color.
2. The problem now is that your title won't dynamically adapt the font color. To fix this, do the following:
   1. Select the page in Visio, and go to the Shape data of the page
   2. Add a shape data with the label 'Options'
   3. Define the value: '#000000=ThemeForeGround|#FF0000=ThemeAccentColor|#FFFFFF=ThemeBackground'
   4. This means that everything in black color, will be replaced with the foreground color of the selected theme (=black in white theme, white in black theme). Everything in red with be replaced with the accent color of Cube, which is blue by default. And everything in white will be replaced with the background color of the selected theme (=white in the white theme, black in the black theme). If your title is black (really black, not dark grey), then your title should now nicely switch color when switching the theme.
3. If you still want to make sections or rectangles in the background to e.g. group something, then use a black rectangle and put the transparency on e.g. 80%.

The alternative would be to make your complete drawing with a fixed theme/color, and therefore you would need to replace that parameter control with your own design. That would be a small circle to show the alarm state, some text field next to it linked to the parameter description and another text field linked to the real time value.

Let me know if something is not clear.

Bert