ST. PAUL (AP) - Minnesota school districts are still having problems with the new statewide online proficiency testing system.

For the second week in a row, districts report their students have experienced long waits for test questions to be delivered through the online testing portal.

The state contracts for testing services with the American Institutes for Research, or AIR. Those tests include the Minnesota Comprehensive Assessment, which measures whether students meet learning benchmarks.

Charlene Briner of the Minnesota Department of Education says nearly 50 districts had trouble with the testing system Tuesday. A week earlier, the department suspended MCA testing after AIR had problems with computer servers that delayed or interrupted thousands of students' tests.

It's unclear what caused the latest slowdown, but Briner says it's unacceptable.