Window has double(?) heigh

The environment:
DE: Unity
zenity: version 3.4.0
Ubuntu: Precise Pengolin 12.04

If you start zenity to start some dialog, it seems to me, that the window that apears gets double the height it needs.
No problem, if the text ist short, but if you have a real long text the bottom of the window is unvisible and the buttons are unreachable ...

... but as you can see in 4.png and 5.png you must pass a specific width ...

For testing here are the sample commands, used for the attachments:

1.png
zenity --question --title="Sample window" --text="some text"

2.png
zenity --question --title="Sample window" --text="some text some text some text some text some text"

3.png
zenity --question --title="Sample window" --text="some text some text some text some text some text some text some text some text some text some text some text some text some text some text some text some text some text some text some text some text"

4.png
zenity --question --title="Sample window" --text="some text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\nsome text\n"

5.png
zenity --question --title="Sample window" --text="some text some text\nsome text some text\nsome text some text\nsome text some text\nsome text some text\nsome text some text\n"

In Lucyd Lynx all is ok, DE is Gnome an zenity version is 3.4.0.