We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:
https://discuss.afni.nimh.nih.gov
Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.
The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.
You should be able to use NIFTI datasets from any source, including SPM. For convenience, you may want to relabel the space with "3drefit -space MNI mask.nii" or use nifti_tool to set the sform_code and qform_code to 3 (NIFTI_XFORM_MNI_152).