Minor Camera Issue

I just installed the latest version tonight, and I found something odd. On the campaign map, I used to be able to zoom in and out using the scroll wheel on my mouse. However, in the newest version, I can't; I have to use the keyboard to do so. Is this a new feature of the mod? Thanks.

EDIT: After further playtime, I found the same is true in battles. Any ideas? I've checked the preferences file to no avail. Also, the scroll wheel works in this web browser, so it's functional. I don't think Windows has an option to turn off the wheel during games.

Very odd. The scrollwheel works in my installation, I have no idea why it doesn't in yours, sorry.