diff --git a/python/BioSimSpace/Sandpit/Exscientia/Trajectory/_trajectory.py b/python/BioSimSpace/Sandpit/Exscientia/Trajectory/_trajectory.py
index e3d747ca0..b49a05d7d 100644
--- a/python/BioSimSpace/Sandpit/Exscientia/Trajectory/_trajectory.py
+++ b/python/BioSimSpace/Sandpit/Exscientia/Trajectory/_trajectory.py
@@ -1120,11 +1120,10 @@ def _split_molecules(frame, pdb, reference, work_dir, property_map={}):
 
     # Create a triclinic space from the information in the frame file.
     if isinstance(frame, _SireIO.AmberRst7):
-        # Get the box dimensions and angles. Take the values, since the
-        # units are wrong.
+        # Get the box dimensions and angles.
         degree = _SireUnits.degree
         dimensions = [x.value() for x in frame.box_dimensions()]
-        angles = [x.value() * degree for x in frame.box_angles()]
+        angles = [x.to(degree) * degree for x in frame.box_angles()]
         box = _SireVol.TriclinicBox(*dimensions, *angles)
     else:
         box = _SireVol.TriclinicBox(frame.box_v1(), frame.box_v2(), frame.box_v3())
diff --git a/python/BioSimSpace/Sandpit/Exscientia/_SireWrappers/_system.py b/python/BioSimSpace/Sandpit/Exscientia/_SireWrappers/_system.py
index 72c3cd4be..cafb3dde0 100644
--- a/python/BioSimSpace/Sandpit/Exscientia/_SireWrappers/_system.py
+++ b/python/BioSimSpace/Sandpit/Exscientia/_SireWrappers/_system.py
@@ -1218,7 +1218,10 @@ def rotateBoxVectors(
         try:
             prop_name = property_map.get("coordinates", "coordinates")
             cursor = cursor.rotate(
-                center=center, matrix=rotation_matrix, map={"coordinates": prop_name}
+                center=center,
+                matrix=rotation_matrix,
+                rotate_velocities=False,
+                map={"coordinates": prop_name},
             )
         except:
             pass
@@ -1227,7 +1230,10 @@ def rotateBoxVectors(
         try:
             prop_name = property_map.get("velocity", "velocity")
             cursor = cursor.rotate(
-                center=center, matrix=rotation_matrix, map={"coordinates": prop_name}
+                center=center,
+                matrix=rotation_matrix,
+                rotate_velocities=False,
+                map={"coordinates": prop_name},
             )
         except:
             pass
@@ -1240,12 +1246,14 @@ def rotateBoxVectors(
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
                 prop_name = property_map.get("coordinates", "coordinates") + "1"
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
             except:
@@ -1257,12 +1265,14 @@ def rotateBoxVectors(
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
                 prop_name = property_map.get("velocity", "velocity") + "1"
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
             except:
diff --git a/python/BioSimSpace/Trajectory/_trajectory.py b/python/BioSimSpace/Trajectory/_trajectory.py
index e3d747ca0..b49a05d7d 100644
--- a/python/BioSimSpace/Trajectory/_trajectory.py
+++ b/python/BioSimSpace/Trajectory/_trajectory.py
@@ -1120,11 +1120,10 @@ def _split_molecules(frame, pdb, reference, work_dir, property_map={}):
 
     # Create a triclinic space from the information in the frame file.
     if isinstance(frame, _SireIO.AmberRst7):
-        # Get the box dimensions and angles. Take the values, since the
-        # units are wrong.
+        # Get the box dimensions and angles.
         degree = _SireUnits.degree
         dimensions = [x.value() for x in frame.box_dimensions()]
-        angles = [x.value() * degree for x in frame.box_angles()]
+        angles = [x.to(degree) * degree for x in frame.box_angles()]
         box = _SireVol.TriclinicBox(*dimensions, *angles)
     else:
         box = _SireVol.TriclinicBox(frame.box_v1(), frame.box_v2(), frame.box_v3())
diff --git a/python/BioSimSpace/_SireWrappers/_system.py b/python/BioSimSpace/_SireWrappers/_system.py
index c6f0e52ed..0a5bf5157 100644
--- a/python/BioSimSpace/_SireWrappers/_system.py
+++ b/python/BioSimSpace/_SireWrappers/_system.py
@@ -1166,7 +1166,10 @@ def rotateBoxVectors(
         try:
             prop_name = property_map.get("coordinates", "coordinates")
             cursor = cursor.rotate(
-                center=center, matrix=rotation_matrix, map={"coordinates": prop_name}
+                center=center,
+                matrix=rotation_matrix,
+                rotate_velocities=False,
+                map={"coordinates": prop_name},
             )
         except:
             pass
@@ -1175,7 +1178,10 @@ def rotateBoxVectors(
         try:
             prop_name = property_map.get("velocity", "velocity")
             cursor = cursor.rotate(
-                center=center, matrix=rotation_matrix, map={"coordinates": prop_name}
+                center=center,
+                matrix=rotation_matrix,
+                rotate_velocities=False,
+                map={"coordinates": prop_name},
             )
         except:
             pass
@@ -1188,12 +1194,14 @@ def rotateBoxVectors(
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
                 prop_name = property_map.get("coordinates", "coordinates") + "1"
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
             except:
@@ -1205,12 +1213,14 @@ def rotateBoxVectors(
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
                 prop_name = property_map.get("velocity", "velocity") + "1"
                 cursor = cursor.rotate(
                     center=center,
                     matrix=rotation_matrix,
+                    rotate_velocities=False,
                     map={"coordinates": prop_name},
                 )
             except: