Desktop color of all our users has become black.

[johndavies]

Hello,

Yes, I do confirm that using the RemoteApp is fixing the issue of a black background color in Seamless mode when the server is a W10 or a W2012 R2
However, this question of black background remains (only on W10 or 2012 R2) for HTML5 clients simply because it is ugly.
This is why we will not "give up" on this specific question.

Kind regards

John Davies