Hi,
Thanks for finding that bug for me!
It is fixed and will be in the next version update.
But if you need it now, you can download a fix here:
http://afni.nimh.nih.gov/pub/dist/data/shiny_temp/global.R
You should right click the link and "Save As".
Then use that "global.R" to replace the previous one in your abin folder (or wherever you put afni)
<where afni lives>/shiny/FATCAT_matplot_shiny/global.R
(<where afni lives> should be replaced by the path to your afni installation)
Let me know if that fixes it for you.
thanks, Justin