I don't know if you already know about it but to reproduce it please run C1WPFSchedulerSamples.exe and select an appointment, modify recurrence to weekly, and select days Friday and Saturday, Recur every 1 week and No End Date. It will select Saturday and Sunday instead of Friday and Saturday. In the recurrence dialog the checkboxes are ok but in the recurrence pattern and in the scheduler are not ok. Can you confirm this?
Thank you.