In three games this year, the San Francisco 49ers offense scored ten points or less in two contests, including a six-point effort against their division rivals, the Seattle Seahawks. Their 12.7 points/game average ranks only higher than Carolina's 10.7 average (thanks Mike Zimmer) and the 49ers 78.0 yards/game rush average is amongst the league's worst.
According to the NFL Network, the 49ers fired their offensive coordinator Jimmy Raye, promoting quarterbacks coach Mike Johnson. While their offensive system hasn't been great, Jason La Canfora writes that, "49ers coach Mike Singletary and Raye have not seen eye-to-eye about the reasons for the team's struggling offense". San Francisco fans are totally fine with that, with 96% of 117 votes supporting the move.
Before you get excited with thoughts of the Bengals maybe following suit with a struggling offense, then ease your anticipation a little. Even though Cincinnati's passing offense has struggled, the offense's 19.7 point/game average ranks 16th and there's never been any indication that Marvin Lewis and Bob Bratkowski have butted heads.