I accepted the contract after ensuring all my modding was working together.
I have tried 2 different vessels, one completely stock parts, the other modded parts
I have successfully completed a 1-man suborbital contract on the save in question.
I started a new game and worked my way back to the point of tourist contracts and confirmed they can be completed (3 single person contracts on a single flight)
It appears that either this single 4-man tourist contract for a suborbital spaceflight is bugged, or 4 man contracts are bugged.
Is there anything to do other than cancel the contract? I've already blown a full flight's worth of funds on this contract.
Update:
I've verified my files in steam, and the contract completed normally, then I took some more contracts, and I'm having the same problem again. guess I'll verify again.
