Panasonic GX1 - Why can't I delete any photos??

I have encountered a problem when deleting pictures:　when I choose a pic to delete, it keeps telling me "editing operation cannot proceed as information processing is ongoing" and a small bar is flashing on the left side of the screen. I checked the manual book but found no answer. So I googled, very few people has the problem but I did found someone who has the same issue. He said I need to let the camera process all the pictures in my SD card before I can delete anything. So I kept the camera on and waited. After the small bar finished flashing ( I think the processing is over) so I tried to delete a picture, it actually worked! Then I thought the problem solved but I WAS WRONG!!
When I turned off the camera and switched on, it happens again!! It just started to process everything again! So does this mean this processing need to be done every time I turn on the camera?　That sucks, because it takes a long time! I cannot let the camera on for that long just to delete one single picture! Deleting a picture should be the most basic function a camera provides, and it shouldn't take such a long time! So I'm asking how to stop this processing? Does this happen to everyone else or it's just this camera, apparently with a quality issue? If anybody knows, please help me! Otherwise I have to return/exchange the camera. Thanks a lot!!