The Baggies had looked set for their first away win after Robert Koren had rounded off a fine attacking game with a 74th minute strike.
But Bradley Orr grabbed a late leveller. His vital touch at the far post came after defenders were out-jumped in the crowded goal area by Marvin Elliott.
Robbie Blake turned in a great performance for Burnley as he sent crisis club Sheffield Wednesday crashing to a record-breaking sixth straight defeat.
The 31-year-old stole the show to pile on the agony for the struggling Yorkshire side, who have now got off to the worst start in their 140-year history and not scored a league goal for more than five hours.
Blake plundered his first league goal since his £250,000 return to Burnley for his second spell at the club, and grafted to create the second finished off by Chris McCann.
Blackpool goalkeeper Paul Rachubka handed Sheffield United a draw on a plate courtesy of an 89th minute blunder.
He allowed a speculative long-range shot from James Beattie to spill out of his hands and roll tantalisingly over the line.
Goals from Stephen Crainey and Ben Burgess looked to have put the Seasiders on course for the win, but they were denied by Beattie's second of the game.
Veteran marksman Dean Windass made a decisive cameo appearance to fire Hull City to their second win of the season as Wolves' dismal run continued at Molineux.
Windass was sent on after 41 minutes, was booked for dissent four minutes later and converted a penalty in the 48th minute before limping off after 65 minutes.
He made no mistake from the spot - sending Wayne Hennessey the wrong way after Neill Collins had brought down Richard Garcia.
In an explosive and controversial last five minutes, Charlton Athletic kept up their impressive early season form with a 2-0 victory over Norwich City at The Valley.
Both goals came from the penalty spot - after 86 and 88 minutes, converted by Andy Reid after Izale McLeod was twice upended in the aread -and the visitors had their veteran skipper Dion Dublin sent off in injury time.
Iain Dowie returned to Selhurst Park and was grateful with a point as his Coventry City side forced a 1-1 draw against his old club Crystal Palace.
Stuart Green fired Palace in front on 26 minutes, but substitute Leon Best levelled the scores with just three minutes left.
Ian Holloway led Plymouth Argyle to their first victory over QPR since the former Rangers boss moved west to take charge at the Pilgrims.
Hungarian international Peter Halmosi, fresh from international duty last week, scored Argyle's first in the 50th minute.
It was a goal worthy of an international occasion. Winger Halmosi jinked his way past a couple of stunned QPR defenders, having been well fed by striker Barry Hayles, and lashed home a stinging drive from the edge of the penalty area.
Argyle doubled their advantage when Sylvan Ebanks-Blake nodded a long ball down to David Norris, who ran through on goal before firing hard past Lee Camp from 12 yards out.
Heinz Muller produced two outstanding second-half saves to earn Barnsley a point in a goalless draw at below-par Stoke.
Gary Megson enjoyed a remarkable return to old territory as his Leicester City side produced a late late show to stun former club Nottingham Forest in the Carling Cup.
Colin Calderwood's side had dominated and were leading 2-1 with three minutes to go - but goals from Richard Stearman and Stephen Clemence saw them snatch a 3-2 win.
Forest had been ahead and cruising after Nathan Tyson's 64th minute strike had restored their advantage following a spectacular free-kick equaliser for Leicester from Alan Sheehan.
The last game had ended in a moment of sportsmanship as Forest agreed to abandon the match at half time following the collapse of Foxes defender Clive Clarke when Forest were leading 1-0.
So it was fitting - albeit a little surprising - the replayed tie also began in sporting fashion with Leicester generously allowing Forest keeper Paul Smith to net straight from the kick off to give Forest their lead.