I got the same problem after running the 2nd-level statistical analysis. The cluster-level p values are NaNs, and I get the following warning when I click "whole brain" to show all the clusters:
Warning: Returning NaN for out of range arguments
> In spm_Pcdf at 88
In spm_P_RF at 106
In spm_P at 48
In spm_list at 487
I searched the documents, but I couldn't find a clear answer for it. Could anyone help me with it?
Thanks very much.