Jamal Campbell-Ryce's 58th-minute penalty miss proved costly as Barnsley held struggling Nottingham Forest to a 1-1 draw.
Campbell-Ryce's opener a minute after the break was not built on when the same player missed a penalty, allowing Forest's Robert Earnshaw (68) to level and take a point.
Gary Sawyer's 86th-minute header saw Plymouth steal a priceless 1-0 win at Blackpool to climb away from the bottom three.
Neither side looked particularly dangerous for most of the match until Sawyer rose to head home Paul Gallagher's corner.
Norwich's plight worsened as they lost 1-0 at home to 10-man Sheffield Wednesday, Jermaine Johnson driving home in the 48th minute. Wednesday had Tommy Spurr sent off for a late second caution.
The mid-table tussle between Doncaster and Watford saw the Hornets claim a 2-1 win in South Yorkshire.
Watford were handed an early boost when Doncaster's Sam Hird diverted the ball into his own net to hand the visitors a 13th-minute lead and Don Cowie headed home a second barely five minutes later.
James Hayter pulled one back five minutes from the end but it proved immaterial.
London rivals QPR and Crystal Palace shared a goalless draw at Loftus Road.
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