Can you tell me if this is still happening? I jsut tested it on Chrome and it successfully updated and stayed. If it doesn't work can you please let me know your browser and operating system?

And let me know what you are trying to put in there because I think it cannot be blank.

I know they are working on the new layout dilligently so there may not be an immediate fix on this (especially since a space works) but I have let a programmer know.