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None of the tools that normally pop up dialog boxes are doing it now (extrude, merge, etc.).

I checked the preferences, but nothing seems to pertain to it.

This appears to be somewhat of a common problem for many(not all) XSI users including myself according to many posts i've read at the XSIbase forums.

Go here to fix it:
File>Preferences>Interaction>Property Editors/Views tab
and check the box beside:
Popup Property Editors on Node Creation

This problem usually only occurs once per install.

Thank you very much.

Hehe, I have that problem as well. What I always did was hold down Ctrl while clicking it, and then it would show up. Good to see I can finally fix it now though, thanks Ace!