As the school year reaches its halfway point, Talbot County education officials have yet to resolve disagreement over controversial grading practices in the district’s two high schools. The Star Democrat reports at the beginning of the school year, principals at Easton High School and St. Michaels High School instructed their teachers to not give grades lower than 50%, even for missing or incomplete work. Some Talbot Board of Education members have expressed frustration with the new practice — and the fact that it wasn’t cleared by the superintendent.