In acp.js, the file loading.gif is referenced. When posting a comment with this plugin enabled, a broken image is shown.
I believe the intended purpose of this image is to let the user know the comment is being posted.
I put another loading image in the acp plugin folder but it still didn't show when posting a comment.
Everything else about this plugin seems to work OK though. Only other problem I came across was with threaded comments. The comment won't post when replying to a previous comment.
Anyone have any fixes?