Sony Personal Audio Docking System - iOS7

Upgraded to iOS7 & now the Sony Personal Audio Docking System (portable radio / iPod / iPhone player) no longer functions. I can place the iPhone (4S) into the dock and it charges but the Sony will no longer control the iPhone. Doesn't matter if it's through the device or the remote control. I've been through all the settings on the iPhone but can't find anything that would prevent this. The 4S with iOS6 is fine however.

Suggestions welcome.