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Sorry for the delay in getting back to you. Yes it's the 64 bit version of JRiver.
So, after talking to Tom about this, he believes the issue lies in JRiver's VST host itself not passing keyboard information. However the DSP host in JRiver seems to work with the DSP version of Stereo Tool and accepts keyboard input correctly. This requires the 32-bit version of JRiver to be installed, which can be done without uninstalling the 64-bit version.
I hope this is an acceptable solution.
If I owned JRiver, I would post on their forums about this issue. I would also request they support the native plugin (libStereoTool), like some other playback/playout software, in case fixing their VST host is too much trouble.