Hello Sarah,

There are a couple of things to check/do:

1) You should have three directories under spm/toolboxes:  wfu_pickatlas, wfu_tbx_common, wfu_resutls_viewer.
2) It is not recommended to add spm or the pickatlas with "subfolders" to the path.  Only add the main spm directory and the wfu_pickatlas directory.  SPM and the PickAtlas will add any other needed directories.  

Hope this helps,
Ben Wagner
ANSIR Lab