By Kate N. Grossman 

Six months after payroll problems began cheating some Chicago teachers out of timely and complete paychecks, the Chicago Teachers Union has filed an unfair labor practice charge against the Chicago Public Schools.

The union says CPS is reneging on its promise to make teachers whole who were shortchanged by glitches in the payroll system that came online last spring. Since April, the CTU has filed nearly 600 grievances over paycheck problems.

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