Why does the cd() command make the shell stop processing ?

[Mr C]

After entering cd ("c:\Users\MyUserName\Documents\Src\Erlang\").
the prompt line number that is displayed is the same line number as
before entering the cd() command.

The shell doesn't properly process any erlang code after that line is
entered.

I'm using Windows 7 Professional with Erlang R14B (erts-5.8.1.1)