Halion Sonic SE 3 loses audio output

Hi all,
I had a rack version of HSSE I was using on Cubase 10 yesterday and it was working fine. The work was saved and computer shut down.
Today, the output of same instrument did not work although the instrument and fader channel were indicating sound was working.

My main outputs are set at L+R channels 1 and 2 and so was halion. I switched halions output to ch2 and it worked but of course only on the right side (which it was at least half set for in the first place).

I searched the forums but didn’t get far so reluctantly went back and saved the instrument settings as a preset and loaded up a new halion from the f11 menu (stereo), loaded the saved preset and it all worked fine.
Bit of a pain but at least the work isn’t unsalvagable.

I wonder if this is a problem when it’s rack loaded ?