Sending a list to system is much cleaner, thank you, but the error remains. I think perhaps for now I will just delete the system call that isn't working, as when I inserted a call to get that preference, the correct value came back -- so perhaps I don't really need to set that particular value. (I read about this command on osxdaily.com.)
Regarding sleep, there was nothing to be gained. I tried a sleep 4 without any change in the error. Perhaps it is a newbie attribute to hope that inserting a sleep will make a problem go away. <grin>
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