nothing works any longer / edit: working well again Rated 5 out of 5 stars

I am using Lightning for many years now, but since today nothing is working any longer.

- New dates can´t be registered
- Existing dates cant´t be deleted or/and changed
- Reminder pop-up window can´t be closed

A calendar which can´t be used is useless.

@ Philipp Kewisch: thanks for your quick response.
I am using TB 15.0.1 and Lightning 1.7
Updated 1 week ago.
Lightning was working well until today.
Yes, i had an error message today by a pop-up window. Something about Lightning, but unfortunately I clicked it away...

edit: problem solved!
In the past I had linked Lightning with reminderfox, which I use in FF.
In TB/Lightning I use the reminderfox calendar instead of private calendar of Lightning, and the setting of the reminderfox calendar was "write-protected". I really don´t know if the setting also was "write-protected" before today (I did not change it consciously), but after deleting "write-protection" everything is working well as usual now.
Now then I gladly change my rating from 1 to 5 stars.

This review is for a previous version of the add-on (1.7). 

Do you get any error console messages? Please make sure you are using the latest versions (also Provider if you use that).