The article "Wikipedia's zealots" from Lawrence Solomon of the Financial Post (link) details issues with the WP article about University of California San Diego professor Naomi Oreskes, who wrote a paper claiming that there was wide consensus about global warming. The paper was challenged by UK scientist Benny Peiser:
...when visiting Oreskes's page on Wikipedia several weeks ago, I was surprised to read not only that Oreskes had been vindicated but that Peiser had been discredited. More than that, the page portrayed Peiser himself as having grudgingly conceded Oreskes's correctness.
Upon checking with Peiser, I found he had done no such thing. The Wikipedia page had misunderstood or distorted his comments. I then exercised the right to edit Wikipedia that we all have, corrected the Wikipedia entry, and advised Peiser that I had done so.
Peiser wrote back saying he couldn't see my corrections on the Wikipedia page. Had I neglected to save them
after editing them, I wondered. I made the changes again, and this time confirmed that the changes had been saved. But then, in a twinkle, they were gone again!