Undone not working
I check by mistake one of my task, and it's gone.
I tried to find it, but has no success.
Firstly, i saw in the comments in other threads, that somewhere in the bottom i can see link "Show all completed tasks". So i can't find it.
I tried to find task in search box and saw the link "search in completed". It was good, that i remember name of the task.
And how can i find completed task if i don't remember it's name?
Secondly, i tried to uncheck 'completed checkbox' and had no success. On the checkbox came in sight loading animation, and it was all. Checkbox remained checked, and loading animation was infinite. Nothing change. I can't undone task.
What i did wrong?