I have a similar issue with AChat on WIndows 7 x64 Home Premium. I use the Take picture button, click to save changes, and I get a black image (not a missing picture image). Outfit changes work just fine, however, and are updated.
I emailed AChat support and they somehow fixed it remotely but without saying what the cause is/was/could be, but since a few patches ago, the problem recurred and I was hoping this time for resolution without having to do the whole support email route.
AChat has been reinstalled (clean) several times, the app and the directories have been given all the privileges they need, so it's not likely a Windows permission thing, a anti-virus thing or the like. I don't know, in a way it's kind of cool having that black box
It makes me sort of distinctive (unless maybe somehow they're implying that I'm in the dark and clueless lol).