Rider University cut 31 jobs because of nationwide problems in processing federal student financial aid forms and other financial problems, campus officials announced. The staff cuts announced last week will save the private university in Lawrenceville in Mercer County more than $2 million, school officials said. Rider is the latest university to blame financial problems and enrollment dips on delays tied to the U.S. Department of Education’s attempts to improve its Free Application for Federal Student Aid — or FAFSA — forms that all students must fill out to receive financial aid. Changes to …