Theme Compatibility
eShop has been fully tested on both the Twenty Eleven and Twenty Ten WordPress themes. It should also be compatible with any theme in the WordPress Theme Repository if that theme was submitted, or updated, since August 2010.
Obviously, any of our current themes should also be fully compatible — especially the Emporium theme which includes some extra, eShop-specific, goodies.
However, we cannot vouch for the compatibility of any other theme. Unfortunately, not all themes are coded to the standards required by wordpress.org. so, if you have a problem please see if you can replicate it when using the Twenty Eleven theme with all other plugins deactivated.
Please note that we were not involved in the creation of the eStore theme from Elegant Themes and, and this time, we do not offer any support for that theme.
Incompatible Themes
The following themes are known to be incompatible with eShop:
zBench
eShop makes use of the core featured image functionality to generate product images. This theme rewrites the featured image HTML output via a custom function — rendering it incompatible with eShop.
Elgeant Themes
We do not support any ET themes — including the Estore theme.

FlipFlop 3.0