Noted, now that we are here, can you please take a look at this one too? We had an explainer as well :) https://www.youtube.com/watch?v=S23V3LmRUb4
As a side note, I thought the animated video was well produced. Would you mind sharing how you made it? (email in profile, if you'd prefer to do so off-thread). Thanks!
a) Clients being slow on delivery of requirements/content but once they deliver it, they want things done urgently
b) Clients being slow to sign off stuff after delivery
c) Late payments after a lot of chasing
Documentation and NDAs can vary from client to client and is usually initiated from their side.
These are my experiences, others may have a different perspective.