Former Alaska Gov. Sarah Palin listens to guests at a clambake in Seabrook, N.H., Thursday, June 2, 2011. Palin has been visiting East coast cities this past week. (AP Photo/Charles Krupa)

Is the relationship between Sarah Palin and Fox News breaking down?

On her Facebook page Wednesday evening, the former Alaska governor wrote that she was "sorry Fox cancelled all my scheduled interviews tonight," because she planned to use them to honor her 2008 running-mate, Sen. John McCain (R-Ariz.).

"Our plans changed based on the fact that the RNC condensed the schedule of speeches from four nights to three," said Bill Shine, Fox News' executive vice president of programming, in a statement. "We look forward to having Governor Palin back as soon as we can."

It would make sense for Palin to offer commentary tonight. Vice presidential candidate Paul Ryan is speaking, and she's the last Republican to hold that role. But she said she was looking forward to McCain "more than any of the other convention speeches."

Palin signed a major contract with Fox in early 2010 and has appeared frequently on the network ever since. Fox News Chief Roger Ailes was reportedly angry at her last year for announcing her decision not to run for president on Fox. According to New York Magazine, her million-dollar-a-year contract is up in 2013.