How to request user input? input function always open file dialog

I have tried several different examples using the input function. No matter which I try, it always opens a file dialog.

[Walter Roberson]

What shows up for

which -all input

There should only be one thing, ending in toolbox/matlab/lang/input

[Stephen23]

@Matt Pace: it sounds like some third-party function is shadowing the inbuilt input. Please tell us exactly what this command prints:

 which input -all