0. Load your RPT file on second monitor in an live viewer like LogExpert.
1. Load Headhunter mission
2. Get boots on the ground
3. Move your all your men around (pavement is possibly required).
Observe:
RPT Spam. Makes it hard to develop your mod like A.C.E. or CBA.
This happened in the previous release of the DEV build as well but not the one before that one. If that helps narrow it down quickly.