Please note that there's also the new ImageJ forum since a while now:
http://forum.imagej.net/A few people ended up posting questions over there about AstroImageJ already, they're all tagged appropriately (
http://forum.imagej.net/tags/astroimagej ), so the AstroImageJ experts might want to also have a look there.
Of course, you're cordially invited to also discuss about AstroImageJ on the new forum (and maybe fully switch over to this modern forum backend), just remember to use the 'astroimagej' tag to make it easier to classify your posts.