All voting problems should be reported.  This includes challenges to eligibility and problems with electronic voting machines (EVMs).  If you have problems, do the following (copied or modified from Brad Blog):

1. Call poll supervisors to observe the problem.
2. Fill out a problem report.
3. Refuse to vote on that machine.
4. Request that the machine be taken out of service.
5. Get a serial number of the machine if possible (may be difficult in many cases).
6. Tell other voters in line which machine it was and that they should NOT vote on that machine!
7. Report it to county/town election office.
8. Report it to the Secretary of State.
9. Call local reporters and tell them the story.
10. Report it by calling voter problem hotlines: 1-866-MYVOTE1 (1-866-698-6831), 1-866-OUR-VOTE (1-866-687-8683), and the CNN Voter Hotline at 877-GOCNN08 (1-877-462-6608).
11. Contact bloggers and Election Integrity websites such as VotersUnite.Org.

(Obviously, steps 3 through 6 are not necessary for challenges to eligibility.)

It is important that all problems are reported.

If you must use an EVM, do not vote a straight party ticket.  There have been problems, and the machines do not record straight party tickets properly.

Here is what Oprah Winfrey said about her traumatic voting experience (video at this site):

“When I voted yesterday electronically, the first vote that you vote for on the ballot is the presidential candidate. It was my first time doing electronic, so I didn’t mark the X strong enough, or I held down too long. Because then when I went back to check it, it had not recorded my presidential vote.”  She then simulated trouble breathing to show how upset she was.    “It didn’t record my presidential vote.”

While Oprah was eventually able to cast her vote, there is no way to know if the EVM actually recorded her vote properly.

Use a paper ballot to avoid problems.