Vicious problem happened to me while testing this application. I was evaluating it today and it all ended up bogging down my computer to a nearly 100% stall, where I was unable to do anything. I don't remember what exactly I was doing in the app, but I noticed that it rapidly hit something in my Edit menu, since that menu was blinking like a "stroboscope". I think it was when I just clicked on a picture-type of clipboard item in shadowClipboard when it happened.
Might have something to do with the fact that I simultaneously had a similar application running (Jumpcut) at the time I tested shadowClipboard. And after a second thought, Jumpcut doesn't allow for image clipboards, it's text-only, so that's a possible theory for what happened. But when I finally reached Terminal and shadowClipboard's pid, and killed it, everything went back to normal. If the problem occurs once again, while still having Jumpcut on, I'll try killing Jumpcut instead, in order to see if I can zero in on the problem as being Jumpcut related.
Now, I know, if you use shadowClipboard, that you don't need Jumpcut or any ditto app, but I just thought I'd report the occurrence I just experienced in here anyway.