Now that I have Daedalus set to Grub boot from it's dedicated ssd partition I booted up (very fast) this morning to note that the sound icon (with mixer ans MSCW) was absent. Reloading jwm didn't solve that so I tried a roll-back to a snapshot made a couple of days ago.
Not only did the snapshot not restore the sound icon, but the initial setup window opened (choice of language, time-zone, keyboard...). That doesn't seem correct. Fortunately I'd taken a Clonezilla image yesterday; flashing that restored everything, except the sound icon. However a reboot with file system check brought back the sound icon. The ssd seems OK
The sound icon disappeared previously so I'm wondering why, and whether it can be restored; xfce allows backup of the panel setup, does jwm have something similar?
Another glitch relates to D control. It recognizes eDP-1 but does not switch to the HDMI monitor. I'm fairly sure that this option has been available on portable EasyOS.
Summary system report text added just in case:
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