I just ran the following to get my thornlist updated:
./GetComponents --root ET_2010_11 -a -u einsteintoolkit.th
and despite GetComponents returning successful:
0 components checked out successfully. 164 components updated successfully.
it checked out ML_BSSN_Test again and misplaced it at the same level as the $ROOT directory:
ls einsteintoolkit.th ET_2010_11 GetComponents ML_BSSN_Test