You might try BigTalker 2.0 (development version) and see if the issue is still present. I should be releasing this version soon with minor adjustments from it’s current development state. I addressed issues found in the latest 1.1.12 release in the 2.0 development branch.
The discussion thread for Big Talker 2.0 is here.
The parent app code is here.
The child app code is here.
Publish the parent, save the child (in the IDE).