I installed DF about two days ago (about May 29, 2017). I have Win 10 64-bit and two 24" monitors, one ASUS and the other LG.
The left monitor I applied a preset 50/50 screen split. The right I have set as my primary monitor. I tried applying a narrow 50 pixel split along the right side for my floating Amicus software toolbar, but that didn't work.

Worse, on my primary screen, I cannot get "child" windows to sites I have opened in Firefox to appear as anything except as temporary 2" square thumbnails that appear only when I hoover my cursor over the Firefox icon in the taskbar. I've minimized everything on both monitors, trying to find if the missing popups are hidden by other windows. No luck. The only place those popups are visible are as these thumbnails, and the thumbnails are not functional (i.e. I cannot type inside the thumbnails themselves).

For example, I use the app LastPass to save login information. Usually when I need to manually add a site to LastPass, I click "Add Site" and a LastPass popup window appears, which I then manually type additional information in. I tried to save my new Binary Fortress account with LastPass, but that was not possible, as the LastPass "Add Site" popup was, again, limited to a useless, tantalizing thumbnail. I tried to take a screenshot of my primary screen using Snipping Tool, but the tool unhelpfully took a screenshot of my left monitor, not my primary monitor with the useless thumbnails. That would have been amusing if I hadn't been struggling so long over the past two days to find the disappearing windows.

In my taskbar on my primary screen:
If I click on the File Explorer taskbar icon on my primary screen, it opens a full size window on my primary screen.
If I click on the Windows Media Player taskbar icon on my primary screen, it opens a full size window on my primary screen.
If I click on the Microsoft Word taskbar icon on my primary screen, it opens a full size window on my primary screen.
If I click on the Snipping Tool taskbar icon on my primary screen, it opens a popup window on my primary screen, but takes a screenshot of my left (non-primary) monitor screen.
If I click on the Microsoft Outlook (2010) taskbar icon on my primary screen, it opens a full size window on my primary screen.
If I click on the Amicus Attorney taskbar icon on my primary screen, nothing happens. I can open an Amicus window using the floating Amicus toolbar. But if I minimize the opened window I cannot open it again from its taskbar icon on my primary screen, even though the Amicus taskbar icon now has a broad pink line underneath it.
If I click on the File Explorer taskbar icon on my primary screen, it opens a full size window on my primary screen.
If I click on the FileCenter Pro Plus taskbar icon on my primary screen, it opens a full size window on the left non-primary screen. If I try to snap the FileCenter window to make it take up 50% of the left screen, nothing happens. If I try to manually drag the edges of the FileCenter window to resize it, nothing happens. The window borders will not move. I can grab the FileCenter window's title bar and drag the window, butit won't snap to 50%. It overlaps whatever open window is on the other 50% of the left monitor.
If I click on the HotDocs Developer taskbar icon on my primary screen, it opens a full size window on my primary screen.

It seems that at least some Firefox "child" windows, Amicus Attorney (2014 Small Firm desktop edition by Gavel and Gown) and FileCenter Pro Plus 10 (by Lucion) are possibly incompatible with DF.

Do you have any suggestions for getting Amicus and FileCenter to work well with DF?

How can I get the Snipping Tool to take screenshots of my primary screen?

Thank you.

Is there a way to toggle DF on and off, short of uninstalling it?

Too often I find DF interfering with the normal use of some of my most-used software programs (e.g. HotDocs, FileCenter, Amicus Attorney).

Thank you.