I think you are using the VTI image, aren't you? If you have installed the Webinterface plugin/extension you may just use its grab utility directly from your browser, no need to go to the web interface itself. Just write on your browser address bar this _http://my-vu-ip/grab (you may omit of course the http:// part). If the Webinterface works in another port than the default 80, then put it accordingly, like this _http://myvuip:81/grab (on my Vu+ it is actually 192.168.1.109:81/grab). Save it as a favourite, and you will always have a nice and high quality screenshot!