The one thing I have notice about the right click menu is that it wont come up if you have one the transofrm tools active. So if you have an objects polygon selected and Scale is active, then you right click, the menu wont come up. Which is about right considering that XSI using all 3 mouse buttons with the transform tools. This is where holding down the ALT button with the right mouse button WILL bring up the right click menu.
However, if you have an objects polygon selected and dont have ANY transform tools active, right clicking WILL bring up the menu.
Weird....but I have gotten into the habbit of just using the ALT key and right clicking no matter what.
GL
Vmpre