It appears that my Mac doesn’t go to sleep with Drobo Dashboard 1.7.2 installed. I can force it to sleep, but the settings in the Energy Saver preferences pane are not respected.
This seems to be confirmed by the fact that
a) the Console does show frequent (1/min or more) DDServiced activity, so this could be resetting the sleep timer
b) sleep works again after I uninstall Drobo Dashboard
Is this a known issue?