What problems did Germany face after World War I?

Germany
faced numerous problems after .  The most pressing involved the political climate.  After the
defeat of Germany, the Wilhelm II was forced to abdicate and the Weimar Republic was declared. 
This was only after a revolution that took place in 1918-19.  The Republic, however, was on
shaky ground to begin with.  There were over thirty political parties, though only six had any
real power.  This situation meant that parties had to form coalitions with one another to get
anything done.  Since the parties were more interested in their survival than that of the
makeshift Republic, these coalitions often proved weak.

There were also at
least three major money problems.  First, the reparation payments of the Versailles Treaty,
though still quite exorbitant, were manageable.  Second, the shift to a peace time economy was
rather smooth because Germany continued to print money, which led to the astronomical inflation
of 1923-4.  Third, because of the weakening by inflation and the dependence on foreign loans,
the Great Depression hit Germany especially hard. 

What was most pressing,
however, was the psychological shock of losing the war.  Many people, especially due to
fabricated military reports, were surprised to learn of Germany's defeat.  (Hitler was one of
these people.)  There was also the stab-in-the-back theory, insisting the military lost because
of poor political support.