A review committee has recommended that the University of Massachusetts at Amherst not renew the contract of Chancellor Robert Holub, setting the stage for the flagship to have had four chancellors in a decade, The Boston Globe reported. Holub declined to comment on his job status, but defended his record to the Globe, saying that various academic indicators were all headed in the right direction. But people familiar with the deliberations about Holub's future said that he was faulted for, among other things, poor political instincts and insufficient concern over declines in black enrollment.