@rok:
I'll try to remove the ._.DS_Store entries from the package for the final release. They are automatically generated by osx in the dirs, so I'll have to make some script that will weed them out.

@ others:
Please try restarting your n800 and then try opening media player again.
If possible, try opening the app from xterm with command:
/usr/bin/MediaCenter
You should be able to know and tell me what is the problem.

Thanks in advance for all your patience and debugging efforts!