Product Page: EAN / Barcodes and Google Category fields missing

[DianeHew]

TITLES have gone missing for the EAN / Barcodes and Google Category fields, although the entry fields are still there. However, when I try to populate them, the information is not retained, for either field: you put the info in, press Save - and it disappears! Also, I'm now getting HTTP 500 error message when trying to upload images.