I assume you mean around the time before the reformation.Many people were dissatisfied with things that could be seen happening in the Catholic Church. People such as Jan Hus, Peter Waldo, and John Wycliffe Martin Luther made attempts at reforming the Catholic ChurchThe selling/abuse of indulgences was a concern of Luther. The reform movement really gained momentum When Martin Luther wrote and made public "The Ninety-Five Theses". This was a list of questions and propositions (mainly about the abuse of indulgences) for public debate.There were many other teachings and practices of the Late Medieval Catholic Church that Luther and others were not happy with. For example, The corruption and sin that was evident among the clergy.In the papal court unbelief, levity and immorality, money and luxurious living seemed to have replaced apostolic poverty and self-denial.Luther for one believed the scriptures should be available for the common people to read, he translated The Bible into everyday German. At that time only the monks had scripture to read and that was in Latin