Thanks for the swift response, DOOMguy. I've just tried that (enclosing in single quotes), and it made no difference - the same error message appears. It's really weird - I've had no problems with this startup command in other versions of Bodhi.
I think what may not be clear to you is that you can combine elements from other themes with your main theme. This is what the Waiter was suggesting you do in an earlier post. You have to first install those other themes, then from the Main menu choose Settings then Theme. At the Theme Selector dialog box click Advanced, where you can select elements from other themes (such as Modules/iBar) to incorporate into your theme.
What Waiter is saying is that this element from the detour theme will stop the mouse effects you mention. I can't comment on this as I haven't tried it.