after insert one task if i want to insert a commentary i need refresh to see it.
please could you fix it
How exactly are you creating a task, through the Quick Add button at the top right or through the "Add task" link on a Project view?
Which every way you do so, you should not have to refresh the page to see the new task, it should be visible already. If you are referring to the fact that you do indeed have to click "Save" before you can add a note/comment, this is true.
We might consider changing this in the future, feel free to vote on this suggestion :) http://todoist.com/Vote/showProposal/422/