Hi, after opening the Peak: peak finding popup and setting the sign of the extrema to search for, the software froze. Here is the error traceback: Exception in Tkinter callback Traceback (most recent call last): File "ccpnmr/python2.5/lib/python2.5/lib-tk/Tkinter.py", line 1403, in __call__ return self.func(*args) File "ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/popups/EditWindow.py", line 556, in setWindowName File "ccpnmr/ccpnmr2.1/python/ccpnmr/api/Analysis.py", line 32037, in setName File "/Applications/ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/AnalysisPopup.py", line 1157, in changedSpectrumWindowName popup = self.popups[old_popup_name] KeyError: 'window_HHN' Exception in Tkinter callback Traceback (most recent call last): File "ccpnmr/python2.5/lib/python2.5/lib-tk/Tkinter.py", line 1403, in __call__ return self.func(*args) File "ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/popups/EditWindow.py", line 556, in setWindowName File "ccpnmr/ccpnmr2.1/python/ccpnmr/api/Analysis.py", line 32037, in setName File "/Applications/ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/AnalysisPopup.py", line 1157, in changedSpectrumWindowName popup = self.popups[old_popup_name] KeyError: 'window_HCC' Exception in Tkinter callback Traceback (most recent call last): File "ccpnmr/python2.5/lib/python2.5/lib-tk/Tkinter.py", line 1403, in __call__ return self.func(*args) File "ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/popups/EditWindow.py", line 556, in setWindowName File "ccpnmr/ccpnmr2.1/python/ccpnmr/api/Analysis.py", line 32037, in setName File "/Applications/ccpnmr/ccpnmr2.1/python/ccpnmr/analysis/AnalysisPopup.py", line 1157, in changedSpectrumWindowName popup = self.popups[old_popup_name] KeyError: 'window_HHC' Any idea what is going on? Thank you, Mattias Brink