Thanks.
Never used Media Keys before, everything was done via Kodi &/or Full Keyboard. Not even sure I recall Media Keys on previous versions of the software. Switched to Media Keys, learnt the IR code & it works!
As a side issue, when running the software on a 1080 laptop screen it doesn't seem to render properly. The window is oversized & just shows the Controller layout. The learning prompts are off the bottom of the screen but there's no scroll bar to reach them. Lenovo Yoga 510 running W10 1803 release on an Intel 520 chipset. Haven't seen this issue with any other software.