Hi I had a window with horizontal and vertical strips, I tried to close all strips and I managed to mess up the window giving the following error; Exception in Tkinter callback Traceback (most recent call last): File "/usr/lib64/python2.4/lib-tk/Tkinter.py", line 1345, in __call__ return self.func(*args) File "/data/prog/ccpnmr/ccpnmr2.0/python/ccpnmr/analysis/popups/WindowPopup.py", line 3716, in motion self.showMotion(x, y, canvas) File "/data/prog/ccpnmr/ccpnmr2.0/python/ccpnmr/analysis/popups/WindowPopup.py", line 3700, in showMotion self.parent.drawCrosshairs(typeLocation, self) File "/data/prog/ccpnmr/ccpnmr2.0/python/ccpnmr/analysis/AnalysisPopup.py", line 311, in drawCrosshairs popup.drawCrosshairs(typeLocation, originatingWindowPopup) File "/data/prog/ccpnmr/ccpnmr2.0/python/ccpnmr/analysis/popups/WindowPopup.py", line 3938, in drawCrosshairs drawCanvasCrosshairs(canvases[j][i], xs, ys, originatingWindowPopup) File "/data/prog/ccpnmr/ccpnmr2.0/python/ccpnmr/analysis/popups/WindowPopup.py", line 3816, in drawCanvasCrosshairs axisRegion = axisRegions[col] IndexError: list index out of range What made this odd was that previously it was a 3D window HCN, but after this error it is now a 2D window HC. As a 2D window it seems to behave OK. Cheers Ben