Plymouth manager Peter Reid could not hide his disappointment after seeing his side lose 2-1 at Peterborough.
Rock-bottom Argyle saw a stoppage-time penalty go begging as Luke Summerfield's kick - awarded after Stephane Zubar had been tripped by Lee Frecklington - was saved by home goalkeeper Joe Lewis.
They had earlier conceded a controversial equaliser when play was allowed to continue despite Rory Fallon being down with a head injury.
Reid said: "It was a good penalty and a great save. That's the way it goes in football sometimes. When you are down at the bottom things don't seem to go for you.
"You'll have to ask the referee why the game was allowed to go on when Peterborough got level. We've got Rory down with a hea dinjury and it is the man he was picking up who scored the goal. It was a double-whammy that we didn't need.
"There's no doubt we deserved something from the game. We more than held our own against a team with good attacking players. I'm delighted with the performance but this was a must-win match for us. We need points and have ended up without any. It's a very hard one to take."