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Dear SPMer, Thanks for concern! I've got a problem when I use the SPM for the MEG data preprocessing: With my data, if I "Epoch" first and "Filter" after, the data looks fine, and I can also visualize my data in time course or scalp by "dispay"-->"M/EEG" ; however, if I reverse the order to do the "filter" first with some band pass filter and then do "Epoch", the data generate lots of "NaN" and I can see nothing of MEG data in "dispay"-->"M/EEG". May I ask what possibility this problem might be coursed? Looking forward to your reply, and thanks in advance! Best, Jing