What were problems with the post revolution national government?

Many. Between the signing of the Articles of Confederation and the ratification of the Constitution of the United States, problems of taxation, land management, currency regulation, and social projects riddled the government. Unfortunately, the question itself is flawed due to the fact that the national government did not exist in the sense that we think of a national government today. The most powerful levels of government were at the state level, with the national level being more a collective attempt by the states to coordinate policy. The largest issue they ran into during this period was the fact that all policies at this level had to be unanimous. But, as stated, the problems faced by the early post-revolutionary government were numerous.