This is the third part of a series of posts detailing the reasons of having different simulation output when rerunning Monte Carlo simulation models using CB. The other parts can be found here:
Part 1: CB Excel functions are not tied to seed
Part 2: Excel RAND() function in CB models - handle with care
Part 4: Multi-threading and seed
This post deals with a rather obscure setting which can lead to this situation. In the Options tab in OptQuest, you will find an option called "Enable low-confidence testing" in the "Advanced Option.." dialog box (as shown below).
Workaround: Do not use this option if you want to reproduce optimization results.