Apply changes mistake

Some controllers doesn’t apply the changes…

that return the message “Impossible to verify the program”.
No error in the program just no take the changes.

I can not explain why, I’m quite sure the problem is not in my pc because I connect to many the controllers without any kind of problems.
For example in someone i can create the backup, or go online but I can not make changes to online.
No uas restrictions…

Any idea?
TNX