If the client doesn't respect me during the bidding process, the client is not worth the trouble. So drama during the bidding process is a huge red flag.
If the client doesn't know what they want, their business model is implausible, or if they seem to have unrealistic expectations that is a huge red flag for me.
If the client is overly disorganized, and business processes are a mess, chances are other problems will occur as time goes on.
If the client doesn't respect me during the bidding process, the client is not worth the trouble.
Drama during the bidding process is a huge red flag. In general drama in the bidding process is a sign to walk away and not even bid.
Chances are, if the project starts off this way, it will be stressful all the way through and everyone will end up unhappy.
If the client doesn't know what they want, their business model is implausible, or if they seem to have unrealistic expectations that is a huge red flag for me.
In each of these cases, the customer is likely to have expectations which cannot be met, and the project will end up in the swamps.
If the client is overly disorganized, and business processes are a mess, chances are other problems will occur as time goes on.
Now this one may be more specific for me since I am automating business processes, but the principle can generalize out a bit. Software supports business processes, not the other way around. You don't want to automate bad business processes, design a spiffy website around an unclear message, or the like. In these cases everyone will leave unhappy.