Ctrl key stuck Remote Desktop

RD Client app broken since Windows 10 Anniversary Update: Shift, Ctrl, and Alt keys not working

I was using the Windows RD Client [App Store version] with Windows 10 uneventfully with perfect functionality right up until the Anniversary Update automatically installed on my machine about a week ago. Now, the Shift, Ctrl, and Alt keys do not work properly
anymore within the remote desktop window. The keys all work fine on my local machine/desktop so it's not a hardware issue.

Here are the detailed behaviors of the various meta keys:

• The Shift and Ctrl keys don't work with the RD client window maximized, but the Alt key does work [- Shift, - Ctrl, + Alt]

• In full-screen mode the Shift, Ctrl, and Alt keys behave the same as when the window is maximized [- Shift, - Ctrl, + Alt]
• The Shift and Ctrl keys do work when the RD client window isn't maximized, but the Alt key doesn't work [+ Shift, + Ctrl, - Alt]
  
• Most bizarrely, if the window isn't maximized, but I drag the side window edges to make the window almost as wide as the screen, it starts to behave as if the window were maximized [- Shift, - Ctrl, +Alt] when both window side edges get close to the side
  screen edges. The same does not happen, however, when I drag the top and bottom window edges up and down, respectively, to make the window as tall as possible.

I need to use the RD Client almost daily for work so this is extremely annoying and affects productivity. I see that I am not the first to report this issue. Is this issue being looked into for a permanent fix rather than the poor workaround solution of
having to alternate maximizing and restoring the window depending on which meta key I need to use? Is uninstalling the Anniversary Update an option, or will it just keep being reinstalled?