ArcGIS Pro Startup Page Silhouette Issue

Question

I'm using the latest software version ArcGIS Pro 2.7.3.  My startup page has a white rectangular silhouette that covers part of the page.  This also happens when I program a custom start page.  It sort of looks like the same size as one of my panes that is docked to the right of the screen.  Any idea how I debug this and get that removed?

Its quite obvious, I don't think I need to circle it:

Wolf · Answer

I will take a look at this.  As a workaround: ArcGIS Pro is using the Chromium Web Control and you can find a sample (also using a pane) here:  arcgis-pro-sdk-community-samples/Framework/ChromiumWebBrowserSample at master · Esri/arcgis-pro-sdk-community-samples (github.com)  and some documentation about the browser control here:  ProConcepts Framework · Esri/arcgis-pro-sdk Wiki (github.com)

JoeMadrigal · Answer

@Wolf With your hint I nailed it down to one of my panes in my Add-in. I have a webbrowser control inside my pane. If I remove it, the the white rectangle goes away. I'm using it so I can print html status messages to a console like window (my pane). Maybe ArcGIS doesn't support webbrowser control inside pane in this way? I'll have to think of an alternative way to display html if I can't fix.

JoeMadrigal · Answer

Its actually my add-in I'm creating.  Ugh, I need to strip down the config.daml so I share it.  I'll keep working it. Thanks.