Rails - Feb 2012 - Rails reCaptcha gem - Not accepting theme option identified in Google's docs

I''m using the recaptcha gem (github.com/ambethia/recaptcha) but have
been
unable to change from the default theme. The google documentation indicates 
that there are four base themes, one of which is ''white''. The
recaptcha_tags docs
identify a :display option:

    :display - Takes a hash containing the theme and tabindex options per the
API. (default nil)

I''m calling the function this way:

    <%= recaptcha_tags :display => { :theme => "white" }
%>

But I only get the default theme, not the white theme. I inserted a puts() 
into the source of the recaptcha gem where the options are parsed and get 
the following:

    Options: {:public_key=>"XXXXXXXXXXXXX-YYYYYYYYYYYYYYY",
:error=>"expression"}

I''ve tried every variation I can think of to pass a :display option
with a
hash of :theme => "white" and can''t get it to work. What
am I doing wrong
here?

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