What are you two? Some sort of double act?
If so, I'll confess to being the Dum one.
Now, will you tell me again why [space] doesn't trigger any autocompletions?
And just as a reminder, 'aus' shows 'Auspex' in the pop-up but still completes as 'auspex' (I know why).
Clicking 'Active' in the tray icon unchecks the option but Auspex remains active.