There is no direct way of doing this but it is possible to do but it will require you looking at the xml file.
If you edit a slide set > goto “Screen Options” top right and enable “Custom Fields”. Scroll right to the bottom of the page and you should see the XML data. Copy that XML and use a site like this:
Paste in the data and you can edit it and should be able to copy it back in and save. Test with a blank slide set first.
I hope that helps?
It seems that the WordPress function is no longer working correctly for updating custom fields. I am not sure why this is but it does not update existing custom fields also. I think that WordPress have broken this function somehow.
Sorry I cannot be of any further assistance.
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