Event details display issue in latest release (2.5.1)

Since updating to 2.5.1 this morning, the event details section using on the single event template is compressed into a tiny column, rather than filing the width of the page.

See here for example: http://www.bendonaldson.org/rlb-wordpress/events/event/ken-rickwood-author-visit/

I’ve reverted the theme back to the original twenty thirteen settings to check that any of my customisations aren’t to blame, but the problem persists.

Any guidance you could give on this would be greatly appreciated.

Thanks,
Ben

http://wordpress.org/plugins/event-organiser/