Cannot change header on a calendar in views

I used date to set up a calendar and then edited it in view. I changed the header for the calendar and now I cannot delete it or change it. I can click on the header and the editor appears allowing me to type in new text, but when I click the save button, nothing changes. Old header appears on the calendar block, the upcoming block, the calendar page, etc. I tried refreshing and clearing the cache. Please help.