The latest version of Jetpack breaks wp-ecommerce which I use for the store portion of my site.
Product pages, the main store page, etc are all blank.
I tried deactivating jetpack and then the store works normally. I tried to delete/reinstall jetpack. When I did this, i was unable to connect to wordpress.com to activate jetpack if the wp-ecommerce plugin was active. I deactivated the wp-ecommerce and then was able to connect jetpack. However with jetpack plugin active, the store is once again broken. Regardless of whether jetpack is connected to wordpress.com doesn't matter, either way it it stopped my store from working.
http://www.punkvinyl.com/store is my site that you can see the blank page due to jetpack being enabled.