Today the sidecart isn't always appearing when I add items and I get the full page cart instead.
Here's an example page: http://www.keepbooks.org/kbproduct-cb.html
We're still in development and every time I've worked on a page I've tested it out. Everything has worked fine until today. It seems that the first time I go to a page and add an item, the full page cart loads. If I refresh the page I get sidecart functionality.
Did I break something / did something change in the Matrix :-)