Why does my memory card not click into place?

Hi:

What do you mean with "it will not go back into the camera"?

Do you mean that the camera cannot read the card?

Or do you mean that the card doesn't fit anymore?

If the problem is the reading of the card in the camera ask yourself if you carry a mobile with you near the card... that can make the card to stop working :)

If the problem is the second choise you have to see if the card is ok or the place where you insert the card. It can be damaged with a fall or something...

Regards