Calendar problem (S planner) - Lost appointments just switching months

Hello everybody, how are you?

I've been having problems with S3 default calendar (s planner), but it's not a sync problem (I think) but another one .
Yesterday I was just switched months to see the next year appointments and when I returned to current month my appointments were lost!
Today I've been trying to create new appointments but I can't, it doesn't save!

ROM: original international version
V4.1.1

Thanks a lot!

I've just discovered that the problem is the widget, if I open the app using icon I can edit, create, delete...
I tried to delete and add the widget again but problem still happen.

Hi just wondering if you ever got this resolved as same thing has happened to me :( ? Cheers