Hi Aaron.
Often, when i import and heightfield in a format different from L3DT (ex. Terragen), i forget to restore default in or Preferences > Heightfield and, therefore, when i try to use L3DTVi2 it happens what you have described here http://www.bundysoft.com/phpBB2/viewtopic.php?t=242&postdays=0&postorder=asc&start=15
It's possible to mantain default (HFF) after importing heightfield or, in alternative, choose as option if maintain file format of heightfield imported or maintain HFF default?
Cheers.
Mauro.