Hi, I was just looking through the atoms in a ccpn project with un-natural amino acids in it and at sometime during the process the atoms in the atom browser window stopped responding. I could click on the drop down menus etc. but the display never changed. Below is the traceback. Best wishes Andy >>> Exception in Tkinter callback Traceback (most recent call last): File "/usr/people/andrewh/CCPN/ccpnmr/python2.6/lib/python2.6/lib-tk/Tkinter.py", line 1410, in __call__ return self.func(*args) File "/usr/people/andrewh/CCPN/ccpnmr/python2.6/lib/python2.6/lib-tk/Tkinter.py", line 495, in callit func(*args) File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/popups/BrowseAtoms.py", line 1026, in update tipTexts=tipTexts) File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/ScrolledMatrix.py", line 2060, in update self.setGraphMenu() File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/ScrolledMatrix.py", line 470, in setGraphMenu options = self.getGraphMenuOptions() File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/ScrolledMatrix.py", line 520, in getGraphMenuOptions submenu.setMenuItems(items) File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/Menu.py", line 177, in setMenuItems self.deleteMenuItems() File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/Menu.py", line 184, in deleteMenuItems self.delete(0, Tkinter.END) File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/Menu.py", line 226, in delete deleteIndex(ind) File "/usr/people/andrewh/CCPN/ccpnmr/ccpnmr2.1/python/memops/gui/Menu.py", line 208, in deleteIndex del self.submenuDict[label] KeyError: 'X: ' -- Dr Andy Herbert Department of Chemistry University of Edinburgh West Mains Road Edinburgh UK EH9 3JJ Tel: +44 (0)131 650 4704 or 650 7372 Email: [log in to unmask] The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.