The Courses tool may not show any content where its plans would appear. This tends to happen when navigating back from an open course to all the plans.
Sometimes you see a flickering effect, where the plans initially appear, then flicker, then disappear. Other times the content is blank from the start.
Clicking on a different tab, then clicking back on the Courses tool tab, apparently "redraws" the content.

This occurs with 7.3.0.0031 on macOS 10.12.2