Blank ProChannel

All of a sudden, when I insert a new audio channel, the ProChannel is completely blank - no EQ, nothing.
 
If I start a new project from normal template, the audio track has the default modules in place, but when I insert a new audio track, nothing.
 
I can insert any module, EQ etc, so it's not disastrous, but I'd just like to know why Sonar would suddenly do this.
 
Any ideas?