Hello dear community, again I have to report a Bug.. this time while inverting my data using either Priors or a Restricted Solution. Im using the latest SPM8 version. When defining a restricted solution, this error occurs after calculation: ----------------------------------------------------------------------------- ??? Error using ==> sparse Index exceeds matrix dimensions. Error in ==> spm_eeg_invert_display at 129 Jmax = abs(sparse(Is,1,Js,Nd,1)); Error in ==> spm_eeg_invert at 884 spm_eeg_invert_display(D{i}); Error in ==> spm_eeg_invert_ui at 103 D = spm_eeg_invert(D); Error in ==> spm_eeg_inv_imag_api>Inverse_Callback at 94 handles.D = spm_eeg_invert_ui(handles.D); Error in ==> spm_eeg_inv_imag_api at 53 feval(varargin{:}); % FEVAL switchyard Error in ==> @(hObject,eventdata)spm_eeg_inv_imag_api('Inverse_Callback',hObject,eventdata,guidata(hObject)) ??? Error while evaluating uicontrol Callback ----------------------------------------------------------------------------- When defining priors, the following error occurs before calculation: ----------------------------------------------------------------------------- ??? Undefined function or variable 'pQ'. Error in ==> spm_eeg_inv_custom_ui at 83 inverse.pQ = pQ; Error in ==> spm_eeg_invert_ui at 75 inverse = spm_eeg_inv_custom_ui(D); Error in ==> spm_eeg_inv_imag_api>Inverse_Callback at 94 handles.D = spm_eeg_invert_ui(handles.D); Error in ==> spm_eeg_inv_imag_api at 53 feval(varargin{:}); % FEVAL switchyard Error in ==> @(hObject,eventdata)spm_eeg_inv_imag_api('Inverse_Callback',hObject,eventdata,guidata(hObject)) ??? Error while evaluating uicontrol Callback ----------------------------------------------------------------------------- Thanks and sorry for finding bugs :o)