demo only starts as root

[inexact]

After installing the demo using

$ sudo sh amnesia_tdd_demo_1.0.sh

the demo won't start as a normal user. The configuration window appears, choosing "Launch game" results in a black screen that disappears quite quickly.

Use

$ sudo /usr/local/games/AmnesiaDemo/Launcher.bin64

and the demo starts correctly. But I don't use Linux to run applications as root.

I also noted that lots of files installed in /usr/local/games/AmnesiaDemo/ belong to user number 500, which does not exist on the default Ubuntu 10.04 installation. Numbering of users starts at 1000 ...

*Edit*
* attached the log file
* note that the files which are reported unable to read in the log are readable according to ls and file:
$ ls -l /usr/local/games/AmnesiaDemo/core/textures/core_dissolve.tga /usr/local/games/AmnesiaDemo/fonts/font_default_00.dds /usr/local/games/AmnesiaDemo/textures/effects/colorconv_sepia.tga
-rw-rw-r-- 1 500 500 16428 2010-09-01 04:33 /usr/local/games/AmnesiaDemo/core/textures/core_dissolve.tga
-rw-rw-r-- 1 500 500 262272 2010-09-01 04:33 /usr/local/games/AmnesiaDemo/fonts/font_default_00.dds
-rw-rw-r-- 1 500 500 812 2010-09-01 04:33 /usr/local/games/AmnesiaDemo/textures/effects/colorconv_sepia.tga

$ file /usr/local/games/AmnesiaDemo/core/textures/core_dissolve.tga /usr/local/games/AmnesiaDemo/fonts/font_default_00.dds /usr/local/games/AmnesiaDemo/textures/effects/colorconv_sepia.tga
/usr/local/games/AmnesiaDemo/core/textures/core_dissolve.tga: Targa image data - Mono 128 x 128
/usr/local/games/AmnesiaDemo/fonts/font_default_00.dds: Microsoft DirectDraw Surface (DDS), 256 x 256,
/usr/local/games/AmnesiaDemo/textures/effects/colorconv_sepia.tga: Targa image data - RGB 256 x 1

Linux 2.6.32-24-generic #42-Ubuntu SMP Fri Aug 20 14:21:58 UTC 2010 x86_64 GNU/Linux
Ubuntu 10.04
NVIDIA Driver Version: 195.36.24
Geforce 9800 GT
Core i5 processor