First of all, I’m using a MacBook Pro with nvidia graphics.
I haven’t seen anyone experiencing that problem. Let me show you an example on the title screen of my game:
This is how Blender’s preview mode renders it:
And this is how Blenderplayer does:
That happens to every blend file. Obviously, parts are missing. This happens to whole objects and to parts of objects.
I have redownloaded it several times, trying both 32 and 64bit version.
Any solution? Thanks in advance.
Blend file!!!
Are you sure you are doing the right thing? I mean, the preview mode of blender has nothing to do with the Game Engine… Perhaps you were referring to the GE Preview mode or an in-game scene.
Have you packed your file, saved it with another name, and re-tried it with BlenderPlayer?
Have you tried making all your objects to be Ghosts or Occluders, and see if you still miss the objects?
P.S. From WHERE have you downloaded BlenderPlayer ??? Doesn’t Blender have a BlenderPlayer binary(executable) supplied along with it(in the package)?
P.S.2: It seems that your camera has been moved(by the game) in the blenderplayer version. Try making the camera not to move(remove all parents, try making it occluder or ghost etc.).
It may also be possible for BlenderPlayer(at least for the version you’re currently having) to be unable to run the filters you’ve applied in blender (like the blur effect).
Removed, the forum software said the post wasn’t long enough, it posted anyway.
I tried all of that, it has nothing to do with the things you’ve mentioned. A friend of mine packed the game with blenderplayer (on mac as well) and everything was just nice.
PS: Of course blenderplayer is included in the blender package. I wanted to say that I redownloaded blender.
Apply any modifiers you have in your scene. The BlenderPlayer doesn’t like it if you have unapplied modifiers on objects.
Wow. I applied the modifiers and… now it works! Thank you so much 
Anything else not to do with the game engine?
BTW, my project’s site: http://www.indiedb.com/games/micro-blitzed
No problem. No, that’s about all that I can think of outside of bugs.