None if you mind your p's & q's.

Wherever people are involved things can become complicated

I've not experienced any difficulties in agency relationships. There might be difficulties in relationships that have nothing to do with agency.

A client fires you.  Or asks you to do something unethical.  Or you have to fire the client.

Well Kennith, remember that what you focus on expands (Bold Law), concentrate on what can go right in these relationships rather than what can go wrong.

none.... just use common sense and follow the true meaning of agency ....

I have no difficulties with anyone at my agency but if I had to pick something I'd say I really dislike it when someone ties up the 1 bathroom at the office.(Jk, of course)

You breach one of your duties!

None that I can think of. 

Kenneth, you have great answers. A

There are new challenges every day.

Always keep in mind that you are working to advance the best interests of your client and not your own to avoid difficulties. Honesty is totally required.

As long as you are honest... no problem

None in my experience.

Nothing to do with agency kennith Frazier just dealing with ass holes who don't want to be honest.

I wish you all the best with your real estate studies. 

Too broad of a question.

Not having one. No clients is a problem.