It looks like you need to add a slide class to your carousel for the simple version to work:
<div class="carousel slide">
The carousel sample has it, and there is a check in the code:
if (!$.support.transition && this.$element.hasClass('slide')) { this.$element.trigger('slide') $active.removeClass('active') $next.addClass('active') this.sliding = false this.$element.trigger('slid') }
Oddly enough, they did not mention it.
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