when i open my calender, i just get a white screen, the calender option button is visible on top, but when i click it, nothing happenes.

when i get a new calendar notification i can watch it fine i just can't open the calendar!

i tried:
- restarting
- restarting Luna
- going into a notification when a new one pops up & going back with the gesture...
- deactivating all my account calendars (google & exchange)

all no result!
the calendar worked good before and i did not install anything today or yesterday!

can some help???