Also keep in mind, vector-type data including tensor type data will not be reoriented. The tensor or eigenvector data will not be reoriented as it is warped.
In case you're not aware of it, we have the following utilities to get data into and out of DTIStudio - 3dAFNItoRaw (for the eigenvector data), @DTI_studio_reposition (to fix the Analyze format from DTIStudio) and DTIStudioFibertoSegments (for displaying DTIStudio's fibers as segments in SUMA).