The tension between Usher and Chris Brown has not cooled off. A week after the two stars clashed behind the scenes in Atlanta, they still have not hashed things out.

People close to the tour say the R&B singers have yet to meet face to face since the backstage argument. That fight pushed the start of their concert back by close to three hours.

One insider describes the vibe between them as "still icy." That runs counter to singer Tank, who has claimed the pair already talked it through and patched things up.

How it started

The blowup reportedly came down to timing. Usher wanted the show to begin as scheduled. Brown preferred to hold off so fans stuck in heavy traffic and road closures could get inside the stadium first.

No problem with the surprise guest

A few days later Brown invited Gabrielle Cheyenne onstage. She is the fan who famously turned him down during an earlier show. Sources say Usher was not bothered by that move at all.

The show goes on

Despite the friction at the top, the people working the tour are said to be in good spirits. Crew members are hoping the two headliners finally sit down soon. They want everyone back on the same page for the dates still left on the tour.