E-voting machines are far more secure, accurate and more auditable than the old mechanical lever-operated voting machines and other systems they replaced, Shafer said. She called vote-flipping concerns a "conspiracy theory from activists and bloggers."

David Bear, a spokesman at e-voting equipment vendor Diebold Election Systems Inc., also disagreed that vote flipping is happening with the machines. "It's not a problem," Bear said. "It doesn't exist. This again falls into the 'what if' scenario."

Voters do make mistakes as they use the machines, he said, just as they used to make mistakes on old-style paper ballots. With e-voting hardware, they are at least able to see their mistakes on review screens or when their optical-scan ballots are kicked back due to a user error, he said.

"I don't think these what if scenarios are just related to e-voting machines," because they could have also occurred using paper ballots in the past, Bear said. "I would argue that the technology has lessened these scenarios."

Did you experience vote flipping or other problems related to e-voting in Tuesday's elections? If so tell us about your experiences by sending an e-mail to editor@computerworld.com.