I found a solution to my mouse wheel-button problem, in case it helps others. My mouse software is MS Intellimouse Explorer 3.0.
It turns out that there is a setting under the `Wheel' tab that actually affects the wheel button also. Nothing I changed in the `Wheel Button' field of the Buttons tab had any effect by itself, but this solved the problem: 1. On the `Buttons' tab, under `Wheel Button', choose `Auto Scroll'. (This is needed, for some reason.) 2. On the `Wheel' tab, under `Wheel Troubleshooter', click the `Advanced' button. 3. Choose the radio button `Only disable IntelliPoint wheel support for the following programs:' 4. Click `Add', navigate to your Emacs `bin' folder and choose `emacs.exe'. 5. Repeat step four for each Emacs version that you have installed (and use). Likewise, repeat it for `gnuclientw.exe', if you use that. 6. Sacrifice a virgin toad (any species, AFAICT) under the first full moon in February, after playing tennis with it for 16 hours and convincing it to eat half a bacon, lettuce, and tomato sandwich with rye toast. (The rye toast was the hard part.) Nothing else seemed to do the trick, but that did. HTH.
