Unknown Metadata Type from Yumex

[Stephen Morris]

WARNING: Unknown metadata type (group_gz) for <b>fedora</b>

I'm getting the above message on a number of repositories, where there 
are a couple of different values between the brackets, when Yumex 
downloaded the metadata this morning as part of it checking for 
available updates. What does it mean and how do I rectify it?

Also, after downloading the metadata and applying the only update 
available, which was an update I was expecting (it was the kmod-nvidia 
update for the new kernel), yumex downloaded all the metadata again and 
produced the same messages. Is the above messages the reason why Yumex 
did the double metadata download?
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