12,
Since your listings have been imported and have been appended with the store window, you items will be displayed on the store window the next time it refreshes. The store window refreshes about every 2 hours.
It's also a possibility that the empty store window has been cached by your browser. Try clearing your cache via the following process:
In Internet Explorer go to the Tools menu, click the Internet Options menu item, then click the "Delete Files" and "Delete Cookies" buttons.
In Firefox, go to Tools -> Options -> Privacy -> Clear All.
Remember to close all browser windows but one while clearing your cache.
I hope this helps=)
-Mike