> {
> odb new_settings("/Equipment/Test FE/Settings");
> new_settings.watch(watch); // <-- here I am getting a segmentation fault
> }

this code has a bug. "watch" is attached to object "new_settings" that is deleted
after the closing curly bracket.

I would say Stefan's odb API should not allow you to write code like this. an API defect.

K.O.