The purpose of this thread is to stimulate discussion about your worst experiences as a screenwriter sharing your work, collaborating, working with lawyers, industry people, contractual problems, con men etc. And if I haven't covered anything and you have another nightmare scenario, let it rip.
I'll get the ball rolling for this thread.
For me, 2014 was in general, a nightmare. Though I started off the year writing three good spec scripts, the second half of the year was a black hole of attempting to collaborate on projects I thought had potential. The first project was a European television show with a production company that hired a seven person writing team. For this supposedly paid gig, I had to creatively audition with a four person panel via Skype, sign a non-disclosure agreement and sit through meetings that were a waste of time. The head writer was terrible, the other writers weren't happy about it, and personally, I wrote about 20 pages and bailed. I was supposed to receive money last year and I've never seen a dime. And the amount isn't worth litigation. At the time, I chalked this one up to my lack of experience and quickly moved on.
The other two collaborations were also with projects with "producers" at the helm and I worked on both of them on spec. They were both rewrite projects with original writers still involved. And, no matter what the original writer tells you, they hate having someone rewrite their work. I felt I did good work on both of these but they turned out to be disasters; and unpaid ones at that. I learned from all of these fiascoes and have never repeated the mistakes of that year.