New Post: UpdateListItems Only Updates the First Record

OK, I've done some more testing and it gets weird. I figured out the only item it will update in a series is the first item, which happens to have an ID of 1. So, breaking it down to its simplest form, I created a short script and attempted to update other folders one at a time.

function UpdateUserMsgFolders() {
    $().SPServices({
        operation: "UpdateListItems",
        async: false,
        batchCmd: "Update",
        listName: "UserMessages",
        valuepairs: [["Title", "9999999999c"], ["BaseName", "9999999999c"]],
        ID: 4,
        completefunc: function(xData, Status) {
            console.log(xData.responseText);
        }
    });
    alert("Completed updates");
}

As long as the ID is 1 (and there is a folder with the ID of 1), everything works fine. If I choose the ID of any other existing folder, the 'Title' changes for the selected folder but the 'BaseName' does not. Does this make sense to anyone?

Thanks,
Geoff