Hi All,
We just got the announcement that ArcGIS Pro 3.4 was released and when we get that type of notification, we always do some internal testing to see if there are any issues using our integrated produts.
It turns out that there is a regression with ArcGIS Pro 3.4.
We have a number of docking windows, which are all Windows Forms controls. They are hosted in WindowsFormsHost elements since AGP uses WPF.
This worked fine in AGP 3.3. With 3.4, if you are using *light* theme, then when you dock any of our windows, the foreground text is set to white, or near white, with a white background effectively making the text invisible.
Here is our property grid:

Here is our scenario manager (also note the color of the text in the "Search" button in the toolbar):

If you switch the theme in ArcGIS Pro to dark, then everything works correctly.
If someone from ESRI could please look into this immediately, it would be greatly appreciated. A patch would also be nice to have as we are about to release a new version of our software.