Very large window shows when try to install QtSDK on Linux Ubuntu

Steps:
1. Double click qtsdkinstaller-x32-2011-10-18-Ubuntu8.04.4LTS.run file icon and the installer starts
2. Click "Next" button and the installer went to install folder select page.
3. Keep the default setting and then click "Next" to go next page.

Expected Result:
The installer window shows normally.
Actually Result:
A very large windows shows and "next" button can't found.

Please see the attached flash. The flash file can be opened with Firefox. Please press "F11" to go full screenmode for better view.

Other Information: If you select custom installation on folder selection page. click next button to component selection page. the Ubuntu may be log out.