My April 2006 version of Caret can't seem to read my existing foci files, and even when I map a new focus, it disappears when I project it, so there may be something squirrelly with cell/foci handling in more recent versions. We've had a few reports about this, and I think John either fixed it or it's on his list.
I am not and have not experienced any problems with foci. Send me the files that you are unable to load.
