Apparently the latest version of Google Base Store Connector has a bug that won't let eBay sellers upload their items.

It gives the following error:

Items ready to publish: 0
Error: the categories you are trying to publish do not contain any
item.

Version 1.0.0.198 is the one giving the problems.

Could anyone who has an older version installed which still works (or even better, the installer) send me a message? I'd love to get a copy of it as right now I can't list my items on Google Base...

This issue has now been solved in version 1.0.0.202.
Make sure you uninstall the older version before installing it.