diff --git a/moldesign/helpers/widgets.py b/moldesign/helpers/widgets.py
index 1b84124..5c4fe97 100644
--- a/moldesign/helpers/widgets.py
+++ b/moldesign/helpers/widgets.py
@@ -59,7 +59,7 @@ def not_installed_method(*args, **kwargs):
 
 
 try:
-    from nbmolviz.uibase import Logger, display_log
+    from nbmolviz.uielements import Logger, display_log
     exports_names('Logger', 'display_log')
 
 except ImportError:
diff --git a/moldesign/molecules/bonds.py b/moldesign/molecules/bonds.py
index 6a2ae59..c0f6063 100644
--- a/moldesign/molecules/bonds.py
+++ b/moldesign/molecules/bonds.py
@@ -25,6 +25,7 @@
 from . import toplevel
 from .. import units as u
 from .. import mathutils
+from .. import geom
 
 
 @toplevel
@@ -95,6 +96,12 @@ def order(self, order):
                 if atom.molecule is self.molecule:
                     atom.bond_graph[nbr] = order
 
+    @property
+    def exists(self):
+        """ bool: whether or not this bond exists
+        """
+        return self.order is not None
+
     @property
     def type(self):
         return self.a1.symbol + self.SYMBOLS.get(self.order, u'?̶') + self.a2.symbol
@@ -129,6 +136,11 @@ def partner(self, atom):
     def length(self):
         return self.a1.distance(self.a2)
 
+    @length.setter
+    def length(self, value):
+        geom.set_distance(self.a1, self.a2, value,
+                          adjustmol=self.exists and not self.is_cyclic)
+
     @property
     def name(self):
         """ str: name of the bond """
@@ -151,6 +163,26 @@ def molecule(self):
     def midpoint(self):
         return (self.a1.position + self.a2.position) / 2.0
 
+    @property
+    def is_cyclic(self):
+        """
+        bool: True if this bond is in one or more rings
+        """
+        visited = set([self.a2])
+
+        def check_for_cycles(atom):
+            visited.add(atom)
+            for nbr in atom.bond_graph:
+                if nbr is self.a2 and atom is not self.a1:
+                    return True
+                if nbr not in visited:
+                    in_cycle = check_for_cycles(nbr)
+                    if in_cycle:
+                        return True
+            return False  # if here, not in a cycle
+        check_for_cycles(self.a1)
+
+
     def align(self, other, centered=True):
         """ Rotates the entire molecule to align this bond with another object.
 
diff --git a/moldesign/orbitals/wfn.py b/moldesign/orbitals/wfn.py
index c7daa14..926a741 100644
--- a/moldesign/orbitals/wfn.py
+++ b/moldesign/orbitals/wfn.py
@@ -19,7 +19,7 @@
 import numpy as np
 import copy
 
-from . import MolecularOrbitals
+from . import Orbital, MolecularOrbitals
 from ..utils import DotDict
 
 
@@ -73,8 +73,12 @@ def __init__(self, mol, num_electrons,
             self.positions = positions.copy()
 
         if self.aobasis is not None:
-            self.orbitals['atomic'] = self.aobasis
             self.aobasis.wfn = self
+            atomic_orbs = [Orbital(c, basis=self.aobasis, wfn=self, name=bf.name)
+                           for c,bf in zip(np.identity(len(self.aobasis)), self.aobasis)]
+            self.orbitals.atomic = MolecularOrbitals(atomic_orbs, wfn=self,
+                                                     basis=self.aobasis,
+                                                     orbtype='atomic')
             for orb in self.aobasis.orbitals:
                 orb.wfn = self
 
diff --git a/moldesign/units/quantity.py b/moldesign/units/quantity.py
index 1c10e2f..8c9d481 100644
--- a/moldesign/units/quantity.py
+++ b/moldesign/units/quantity.py
@@ -125,7 +125,10 @@ def __deepcopy__(self, memo):
         return result
 
     def __hash__(self):
-        return hash((self._magnitude, str(self.units)))
+        m = self._magnitude
+        if isinstance(m, np.ndarray) and m.shape == ():
+            m = float(m)
+        return hash((m, str(self.units)))
 
     def __setitem__(self, key, value):
         from . import array as quantityarray