Well I have version 2.4. And I know there are newer versions. Maybe you should try them. I remember some older versions being buggy.
No picture? Did you hit "File--->show page" (or press left shift + S)? I think your picture might be there somewhere inside a gigantic canvas.
I did have issues with .LBM files saved by grafx2 though. It's weird, the old version which saved IFF worked fine, but this new version is being poopy.