Hi Stef,
unless there are non-english symbols (e.g. Umlauts, special characters, some kind of white space) in the file or folder names, this looks more like a problem not directly related to MATLAB and SPM. Can you read and write other files (e.g. using SPM Image Calculator) in the same folder? Does the analysis run on a copy of the data in a different folder/hard disk?
Best
Volkmar
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