In the voltage meu, under voltage configuration, are you selecting the right configuration that matches your motherboard?
Running MBM5 on my computer with an Epox 8KHA+ mb, I had initially selected the first configuration which was slightly different from my Epox config. My readings for the 5v and 12v were fine, but my 3.3v only showed 1.5v. After I selected the second correct config, my 3.3v read as 3.24-3.26v.
Hope your problem is as easily solved as this one was.