Here is a workaround for the updates for Windows 10 Anniversary update that breaks Remote Web Workplace users connectivity to their workstations:

On the computer used to connect to the remote computer:

I got it working as a workaround by replacing the mstscax.dll (Version 10.0.14393.0) in %windir%\SysWOW64\ with the "backup file" in "Windows.old\WINDOWS\SysWOW64" version (10.0.10586.494)

I had to take ownership of the file and give Administrators Full control access to be able to replace the file.