Problem With the OSC Interface

Hi MuseScore.

I am supporting Musadario, who is trying to get my MidiSightReader plugin to work (see https://musescore.org/en/node/267051).

I have recently bought a new laptop which runs Windows 10 Home (64-bit) and now the plugin does not fully work when using MuseScore 2.1.0.

The plugin starts OK, but after displaying a copyright message it should turn the first note of the score red (by using on OSC command). This often does not happen, but occasionally does. When I play the notes on my midi keyboard, they do turn green correctly on the screen.
When I run the plugin again, it should turn all the notes in the score back to black, but this is not happening.

I am using 64-bit Java version 1.8.0_144.

Previously the plugin worked on 32-bit Windows Vista.

So, my question is why is the OSC interface not fully working on Windows 10? It partially works, as the notes reliably turn green, but why do they not turn red or black reliably?
Any thoughts?

Thanks
Don.