Help with Panasonic Lumix DMC-LC70

Hi folks,

Looking for any help you can offer. My friend had a number of photos on her
Lumix DMC-LC70 and transferred the memory card to another camera (Kodak,
model unknown). As soon as she did this a number of photos appeared to be
'blacked' out.

When she put the memory card back into her camera some of the photos
returned but others remained black.

Anyone know if this is common and can be fixed, or should this sort of
practice generally be avoided? Alternatively do you know where I can find
some information on the subject?

Cheers,

MaskOfGonk