[Plugin: Visual Form Builder] checkbox/radio not appearing

When I add the checkbox or radio buttons, they appear as very slim horizontal lines in the editor, and they are so slim that the arrowhead to expend them cannot be accessed so I can’t enter titles, etc.

Also, the red “remove” button for checkboxes and radio buttons will not remove these items.

The checkboxes and radio buttons do appear on the form itself when it’s opened from my site’s navigation bar, but if I can’t edit the item’s content, it won’t work for me.

I’m using wordpress 3.3.1.

Any ideas, folks?
2/5/12 1300est