When users view the the School Calendar in NetClassroom, it does not reflect what is set up for that school in the scheduling calendar in Configuration. Academic Years, but the cycle day is correct on the homepage. Cycle days might show as skipping, and may also show for days marked to not be in session in the School Calendar.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.