I have just updated to v6.7.0.53b beta, and have noticed that the 'Actions log' is continually writing entries.
That never occurred, previously, with older version.
The problem has been fixed with v6.7.0.55 beta. :)
Thanks Tarnak. Yes, I made a mistake, got a little too hasty/over-confident with a last minute change. Betas are betas, I suppose, but I still am embarrassed.