I have been combing through these forums as well as others and I am unable to find anyone who has this issue.
This only happens under Windows 7. I have installed all the Lenovo drivers included in the System Update as well as the Betas but never can solve this.
The problem occurs when I try to eject the T60 (8743) from the Adv Mini dock that has the USB Fingerprint Keyboard connected. If I remove the keyboard before undocking it is fine and the machine undocks normally.
Other than this issue, Windows7 works quite well on this system.