Daniel,
I'll need to review the google merchant stuff to see what is going on with this - but basically Google Base (or Google Merchant) have their own set of "product attributes" that they require. One of those is product type.
Apparently the CRE Loaded tool failed to generate a type for some products OR (more likely) Google changed some of their product type data so that it doesn't recognize the CRE Loaded generated type any longer.
David