In other places such as Maryland and North Carolina, where past e-voting snafus had occurred, voting seemed to be going more smoothly, according to elections officials.

"We've had a remarkably smooth start to the elections this morning in Maryland," said Linda Lamone, administrator for the Maryland state board of elections. She noted good voter turnout, and "exceptionally smooth performance from the voting machines and the election judges."

The state runs Diebold's TSX machines, as well as electronic polling books from Diebold that contain a database of eligible voters.

Elections officials in Montgomery County, Md. and elsewhere complained of problems with the polling books during the September primary. Diebold said it had remedied the issue.