My ruby applications have suddenly stopped running on my PC.  It looks
like the gem libraries are no longer in the path.  My gems are
installed to this directory C:\ruby\lib\ruby\gems\1.8\gems\

I never had to setup a manual path for this, it was "auto-magically"
handled by Ruby.  Any ideas what would cause this to just quit working
like this and how to fix it?  Is there some Ruby config file that loads
the paths etc...

Thanks!