Thick fog shrouding the mountains at the Sochi Olympics forced organisers to postpone events on Monday.
Warm temperatures at the Games have failed to disrupt the sporting action but thick cloud cover in the mountains at Rosa Khutor meant the men's biathlon 15km mass start and men's snowboard cross could not go ahead as planned.
The biathlon event, originally slated for Sunday, has been put back again until Tuesday, meaning Norwegian star Ole Einar Bjoerndalen will have to wait longer for his bid for a record 13th Winter Olympics medal.
No new time has been set.
The men's snowboard cross competition, featuring Australia's gold medal favourite Alex `Chumpy' Pullin, has been rescheduled for 10:30am local time (1730 AEDT) on Tuesday with a shortened format.
Coaches at the Laura biathlon course said the biggest problem was not so much the fog as the poor quality of the snow.
"The problem is not really the fog, it's the state of the track," Siegfried Mazet, the French team's biathlon shooting coach said. "The snow cover is too wet."
Alpine skiers have expressed doubts over variable conditions, with winter-like snow and ice on top of runs through to spring-like softer snow conditions at the bottom.
But Austria-born Patrick Riml, the US team's alpine director, said conditions were "not an excuse for me" and changing conditions were "part of the game".
"The conditions are unusual, there's no doubt about that. But it's the same for everybody. I can't say there was one race where it was completely crappy after number 22," he said.
Despite the challenges, the International Olympic Committee remained bullish. Spokesman Mark Adams said: "No event has been cancelled so far".