Buttons [Underline] and [Character Spacing] section “Properties> Text” work incorrectly when they try to snap pop-ups option dialogs on the display. In order to snap these windows, you must move the cursor to the bottom of the dialog window, hold down the left mouse button pressed. Otherwise, when you let go of the left mouse button, these two windows are closed.
Pop-ups the other buttons section Properties behave correctly. Other dialog windows opened and attached when you click the left button on the "▼" - [button|▼].
*** This bug has been marked as a duplicate of bug 67344 ***