Camera.ViewportToWorldPoint inconsistency

I'm doing a volleyball game (Tikiball WIP post) and found some strange behavior on Camera.ViewportToWorldPoint. I don't know whether it's my fault (most probably) or not.

I'm using

Code (CSharp):

1. Camera.main.ViewportToWorldPoint (position);

to translate a position in Viewport coordinates to a position in Worldpoint coordinates.

If the project is exported to the web, the first time the game is loaded, for certain positions, ViewportToWorldPoint returns different values whether it's called in Start or in Awake. After refreshing the page, the values returned when called in both methods are the same (the expected outcome).

I've made a small project to show this and is available at http://mulitasoft.com/games/tikiball/viewport-test
Source code is at https://github.com/luisparravicini/test-ViewportToWorldPoint/
I'm using Unity 4.5.1f3

My results (in the first run) are:

​

You'll notice point A have a negative value and ViewportToWorldPoint only mentions a range of [0,1]. So this might be a case of just me using an invalid value (althought it works fine in the editor). But point B is in the range specified in the docs and it also gives incorrect values.

Do you get similar results as me? Any ideas why is this happening?

 

Anyone has any idea on why this is happening?
It seems a Unity bug to me