QT crashes if elemnt will be moved in DesignManager.

If i put an commentary in the beginning of an qml file the qt-creator crashes when i try to move an component two times in the "DesignManager". if i move just once go to "Edit" and back to "DesignManager" i can move it again but also just one.
if i remove the commentary in the beginning of the code all is working fine.
it's no different if i comment with "//" or with "/* ...*/"

an example qml file you find in the attachments it also crashs if you just place an rectangle.
if i remove all the comment before the "rectangle main" it will work.
if i put the comment at the end of the code it works too.

Regards Peter