Robigo was spawning good batches of missions 3-4 days ago, I was able to stack 5-6 missions at a time in my Python.
Now, as I read this I am waiting for the board to refresh...it has been over an hour and I've found one viable mission. One.
If you are patient with the mission board (and some liberal mode switching) you can still stack missions, but they aren't spawning 5 at a time like they were 3-4 days ago.
Edit: The missions which are labeled "Snake in X slaves" are not quite fail on scan, but each time you get scanned with the cargo it costs about 1M or so from the final payout (plus the fine should you choose to pay it). The "Haul X slaves for the fun of it" missions have no scan penalty other than the usual fine.