I noticed the same thing when I tried using it on my evo 4g lte. I couldn't stand it so I went back to the stock one. I'm also running ViperOne & haven't had an issue with my voice mail expect there wasn't an app to click into to access it. It would just notify me when I got on. When I re-installed the stock messaging app instead of the modified one that came installed on ViperOne everything worked like it did before I changed roms. The icons came back & everything. BTW, did you try installing the modded mms app over in the development section? It's just like the stock one except the MMS sizes are larger.
My life is a complicated drinking game...