Unity player crashes browsers.

Unity Engine
1

I have Windows 7 pro 64bit and the player information on my browsers says: version 4.0.1f2 and that is the version of unity I used.
I created a demo: http://www.art-werx.com/unity/Pack.html
The player crashes none of my browsers when I test it online on the machine that I used to create the demo. At the time I first uploaded the demo it didnt crash the browsers of other users (my students who tested the demo). Now the demo crashes when users try to use the walk or move animation command. Other commands online seem ok. I wonder what has changed, why this is happening, but more importantly how to fix it?

Any help appreciated.
Cheers

2

SOLVED
The simplest thing. For anyone else: I had not updated my unity player and since the my demo version there seems to have been quite a few iterations of the program. Now my version crashes in my browser which is dandy cause I can test.