Hi Matt,
If this conflict only appeared after you added the css to the site, it must be a coincidence. The CSS I gave you only hides the price at the top of a single event, but it doesn’t interfere in any way with the WooCommerce Multi Currency plugin.
For instance, what happen if you remove .tribe-events-schedule .tribe-events-cost {display:none;}? Does the dollar/pound symbol goes back to the left?
Cheers,
Jeremy