(FFG Forum editor doesn't work too well on iPad hence the blank post, sorry!)

As I was trying to say... from the Rules of Play "Investigator players decide as a group the order in which they wish to act"

Does this mean they can choose the order every turn as in Descent? Or that play order is set once decided? Haven't played yet, the former makes sense but would it give an investigator who moves at he end of one turn and the beginning of the next any unfair advantages?

It's the same as in Descent.

Thanks for the clarification

Yes, they may their order every turn.