Mafisto, please note that all tuner functions in relation to the button controls are described here. You can move incrementally up and down the dial if you use the remote control. (The functions are labled as "Tuner: Increment Frequency" in the button guide.)

The feature that broke was the scan for next strong frequency. That bug is described here in a new FAQ entry I just created because I realized there had been some other questions about that feature here recently.