i have the same issue
i have created an extension .
you can get my packaged zip file of my extension from the following url:
i created this extension for the exporting a csv file which contains products data.This csv file contains all products data that have an custom attribute (Junglee Export Product) set to YES.
My extension is working fine after packaging also.
when i install this extension with the packaged zip file in magento admin connect manager it gets inatlled and working fine. So i posted it in magento connect. but they are not accepting it. i think there is an issue with extension key, channel, version numbers.
plz can any one help me out