Vale’s losing streak was stretched to four matches despite Marc Richards’ ninth goal of the season.
Despite Richards’ opener, visitors AFC Wimbledon completed the double over Vale thanks to goals from Midson and Moore.
Supporters again demonstrated against the board, whose appalling mismangement of the club is of course, along with so many other things, directly contributing to the lack of transfer funds for manager Micky Adams.
Adams was once again forced to shuffle his diminishing pack with Lee Collins and Clayton McDonald both out of this game. Sam Morsy came into midfield with Doug Loft filling in as left-back. Louis Dodds was the only senior player on the bench.
Despite the changes, Vale had the better of the opening exchanges with Rigg and Pope threatening and Sam Morsy impressive in midfield.
And on the half-hour mark, good play by Loft and Rigg set up Marc Richards to score his ninth of the season and his 67th Vale career goal.
But with Vale looking comfortable, they then conceded a bizarre equaliser, as the ball somehow crossed the goal-line with Martin stranded.
In the second-half sub Louis Dodds nearly made an immediate impression hitting the post moments after coming on, but it was the visitors’ sub who made the bigger impact with Moore giving the Dons the lead on 75 minutes.
It was hard luck on Micky Adams’ team but this result will only increase the gloom both on and off the pitch at Vale Park
Vale: Martin, Yates, Owen, McCombe, Loft, Rigg, Griffith (Roe), Morsy, Williamson (James), Pope (Dodds), Richards
Subs: Davis, Johnson