2.0, rev 7c8fbda, Measure with repeat sign can't be changed

Select a measure, Copy... Select the next measure containing the sign of measure repetition, Paste --> nothing happens
Select a measure, Copy... Select the sign of measure repetition from the next measure, Paste --> nothing happens
Select the sign of measure repetition, Delete-->measure becomes empty (completely empty)--> impossible to write anything in.
The only one way I know to overcome this bug is to modify the source file with a text editor.