Hi Dr Cox
Thanks for the help...
Yes, AFNI_AUTOGZIP is turned on, so I turned it off and I'm running the program again (it takes an hour to finish).
Here's the output from the last time I ran it:
++ 3dAutoTcorrelate: AFNI version=AFNI_2008_07_18_1710 (Nov 9 2008) [64-bit]
Number of voxels in mask : 30221
++ Memory required = 13028.0 Mbytes for 30221 output sub-bricks
.........:.........:........alotofthese....*** Datablock write error: cannot open output brick file - do you have write permission?
++ Wrote output: ./PNP19_fullauco+orig.BRIK
It does not, in fact, write the BRIK file, and it only says that because 3dAutoTCorrelate's coded to say that it wrote the file at the end of the program.
-Prantik