Colin, it looks like I'm experienced the same problem described by others. I've reinstalled v19, and the problem disappears, so it's something introduced since then. The issue occurs after I run a focusing sequence in FocusMax. The next exposure, which is usually a light frame in a sequence, stalls after the exposure completes, with the message, "Waiting for StartDownload" (or something close). There is a delay, around 10s, and then the image downloads. This occurs whether I'm running under automation via ACP, or a MaximDL sequence, or just attempting a manual exposure after the focusing run. The problem persists indefinitely until I disconnect and reconnect to the camera in Maxim. Again, v19 works fine.