What did you do to cause this? Accessed the installer with Internet Explorer 9.
What page were you on? http://my.site.com/traq/install/
What PHP and MySQL versions do you run? (client side issue)
Describe the defect: Style sheet loads, but displays incorrectly with Internet Explorer 9.
This is because Internet Explorer never has, and never will, be supported.
I refuse to go out of my way to fix Microsoft's incompetence.