Can't save changes to my backup jobs

Hello,

I use the latest version of Acronis backup and recovery 11.
For some reason after a moment (sometimes a fey days) when I edit my backup job , the save button is not enable anymore. Even when I change something first.
When I clone the job, I also can’t save the changes in the cloned one.
If a make new job I just can save the new job.
Anybody knows why this happens?

thx..