Gail Thompson, who was demoted last week from project manager of the troubled Mimai-Dade Performing Arts Center project, suddenly quit her new job Monday. “Building of the center, touted as Miami’s cultural centerpiece, is 20 months behind schedule and $67 million over budget. Thompson, hired in 1999 after successfully overseeing the construction of Newark, New Jersey’s Performing Arts Center, was pushed aside last week by Miami-Dade County Manager George Burgess in an attempt to get the project back on track.”