vsplit not producing equal viewports in Vim 7.2

I recently updated from Vim 7.1 to 7.2, and I've noticed that the
vsplit command in my vimrc is not producing equal sized viewports.
This is on Windows XP. My vimrc has

set columns=176
vsplit

Under 7.1, this gave me two equal sized viewports. Under 7.2, it
gives me one about 72 columns wide, with the remaining space in the
other. Ctrl-W = resizes the viewport fine. Also, if I open a file,
and then from within vim run the above commands, the viewports are set
correctly. Any ideas what could be going on?

Thanks

Matt

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