Keyboard unusable in RDM after Win10 anniversary update

After update to the Windows Anniversary build, RDM running in a Parallels virtual machine "loses" the state of the shift key on a US English keyboard. This happens on the production version RDM, which I believe was 11.6.1 and the latest beta (11.6.6).

I tried numerous attempts to fix this issue:

=> I removed and re-added the US QWERTY profile to Windows

=> Removed and reinstalled the hypervisor's virtualization drivers (Parallels Tools)

=> Tested a variety of other applications in the Windows VM, none of which have this problem.

A screenshot is attached. As you can see, if I start a newly opened session and enter a series of dollar signs, all is well until I stop, released the shift key and then attempt to enter more dollar signs. There after, until reboot of the Windows VM in which RDM is running, all shifted characters are unavailable.

Having just one use of the shift key per Windows boot makes RDM unusable (sigh).