Contractors, what is your biggest problem at work?
Many contractors have problems with agencies : they can pay late, try to reduce your fee, make renewing contracts difficult. Agents aren't on your side, of course, they're just trying to make as much money as they can. This often leads to friction, as your interests may not be the same as theirs.
But you could also have problems with the client who wants more than the contract includes. Clients can be too pushy, or they can try to terminate you early when they decide they don't need you any longer. And you could also have problems with accountants or lawyers who aren't doing their job. And there is always the tax man...
Why don't you share your problems with the rest of us?