HttpPostedFileBase file = base.Request.Files["photo"];
ImageResizer.ImageJob i =
    new ImageResizer.ImageJob(file,
                              "~/OrigFiles/" + cvm.Id + ".<ext>",
                              new ImageResizer.Instructions("width=768;height=1024;format=jpg;mode=max;autorotate=true;"));
i.CreateParentDirectory = true;
i.Build();

You are using plugins from the Creative Edition: DiskCache (Performance Edition), WatermarkPlugin (Creative Edition)

Registered plugins:

ImageResizer.Plugins.Basic.DefaultEncoder
ImageResizer.Plugins.Basic.NoCache
ImageResizer.Plugins.Basic.ClientCache
ImageResizer.Plugins.Basic.Diagnostic
ImageResizer.Plugins.Basic.SizeLimiting
ImageResizer.Plugins.MvcRoutingShim.MvcRoutingShimPlugin
ImageResizer.Plugins.DiskCache.DiskCache
ImageResizer.Plugins.Watermark.WatermarkPlugin
ImageResizer.Plugins.Basic.AutoRotate

Configuration:

<resizer>
  <plugins>
    <add name="MvcRoutingShim" />
    <add name="DiskCache" />
    <add name="Watermark" />
    <add name="AutoRotate" />
  </plugins>
  <watermarks>
    <otherimages path="~/watermarks" right="20" bottom="20" width="20" height="20" />
    <group name="portraitBG">
      <image path="~/PORTRAIT.png" imageQuery="" top="0" left="0" />
      <text text="#{name}" vertical="false" align="center" top="818" fontSize="60" color="FFF" />
    </group>
    <group name="landscapeBG">
      <image path="~/LANDSCAPE.png" imageQuery="" top="0" left="0" />
      <text text="#{name}" vertical="false" left="50" top="650" fontSize="60" color="FFF" />
    </group>
  </watermarks>
</resizer>