Thanks Eric - I have added my system details to my profile for future reference.
Re issues - it relates to my main system and was experienced when playing tracks from my NAS and also TIDAL.
Since posting my query, after giving up on getting something to play yesterday, I popped out for an hour and on arriving home found my system playing a track - so while it would not initially play anything (I could load a track but when I pressed the play button nothing changed and the track did not play, despite seeing a message displayed stating the track was playing - this was not supported by the tracker at the bottom of the interface or the play button changing shape)
As suggested by you, I switched off all equipment then unplugged each from their power outlet for 30 secs, then plugged them back in and switched them on. This did not resolve the problem.
I then noticed options available on my Aries had changed so suspect the issue may be with my Aries. I’m now looking into this and will come back with an update. Thanks again, Steve.