Megan,
The results from option -wsMVT should be used as complementary ones to the default F-stats. In other words, they are useful only if you see any statistically significant regions that fail to show up in the conventional F-stats.
> in the view the autorange for each of these F sub bricks is 0 to %
This is strange. Do you mind provide the output of the following command?
3dinfo -verb GO-NOGO135ANCOVA+tlrc
Gang