I think commit 4fbdfe2 broke single-select widgets. If the "multiple" widget property is False, the template ends up producing:
…which unfortunately is the same as:
I think the relevant line should look like this instead:
multiple multiple|field.widget.multiple and 'multiple' or None
You can see the problem at http://deformdemo.repoze.org/select/ - it should show a single select field, but instead it's a multiple select field.
It works fine in 0.9.7.
Un-break single select widget.
Thanks for the report!