Dear Bedda,
FDR on voxel level is not recommended any longer (see Chumbley & Friston, 2009, http://dx.doi.org/10.1016/j.neuroimage.2008.05.021 ), therefore it is disabled per default, although it can be activated again as you probably did. Within spm_defaults.m, set
defaults.stats.topoFDR = 1
again, which is the default setting. Choose an uncorrected voxel threshold, e.g. .001, the results table includes FDR corrected p-values on cluster-level then.
Best,
Helmut
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