GIMP :: Closes On Its Own?

If I save an image I'm working on, GIMP closes on me. It's merely annoying if I save as an xcf. If I forgot to do that first (I try not to, but it happens), I have only that final image, which usually isn't the only one I wanted.

Today I was cropping photos for various closeups. I copied and saved a selection I wanted to a new image and saved as a jpg, then both the old and new image closed. I then opened two photos in separate images. Cropped one, saved it and it was okay. Undid the cropping and cropped another section and saved it and Poof! Gone again along with the other photo that I had not touched, yet.

When I used GIMP in Windows it never did this. I'm now using Ubuntu and it is almost always doing this. I was under the impression that GIMP and Ubuntu worked well together. This is not what I'd call working together well.

What do I need to do to fix this problem? I have checked my settings, reset them, returned them to default, put them back to my preferences, all to no avail. Size of the image seems to make no difference as it happens to small kilo images as well as multi gig images.