Based on a conversation with Nonprofit Quarterly's Ruth McCambridge and Kate Barr, the executive director of the Nonprofits Assistance Fund, this web page has a lot of resources centered around common ways nonprofits get into financial trouble.
In addition to the hour-long webinar, the page includes a half-dozen articles on topics like the dynamics of funding and decision-making during a financial crisis.
There is also a list of a dozen case studies from NPQ. Some are about larger and/or arts-based nonprofits (such as Chicago's Field Museum). Many cover community-based, social service organizations, including profiles of trouble caused by "founder's syndrome," expenses tied to owning a building, and poor financial management.