Lost right mouse button after upgrade to 2.3

[Stefan Hakenberg]

Hi,
After upgrading to 2.3 I lost the right button function of a Kensington 
2-button mouse.  I am using an old world set up on a beige 233Mhz tower.
No problems I had with the same upgrade to 2.3 on a titanium 400Mhz 
powerbook with a macally 2-button mouse.  Does anybody have any 
suggestions as to what I could do to fix the problem?  There is no 
control panel where one can set the mouse button functions. At least I 
didn't find one.
Thanks!
Stefan