Just updated to Windows 10 for 7. Trying out some of the Windows Store Apps (Facebook and Twitter) and tried setting them up in a nice tiled fashion. Twitter, Skype, Outlook all remember their its position and size on relaunch. Facebook and Slack do not. On Windows 7 Slack was fine. I can't tell about Facebook because there was no desktop app for FB....
Anyway here's what I want to be persistent (this is my second monitor):
And here's what happens on relaunch of Twitter, FB, and Slack (showing both monitors since Slack launches into monitor 1 -- monitor 2 begins at the left edge of the Facebook app):
Is there any way to overcome this?