When you first try out MyCurator, some clients find that the Source It and Get It tools display a “404 Not Found” page from their web site. Another case is they display a “500 Internal Server Error” page. In both of these instances, the cause is that the Get It or Source It tools are being blocked from operation by your host installation.
Unfortunately, a browser won’t let a program such as MyCurator re-size the window once it is open – a security issue I guess. What you can do is change the default size of the window, especially if you normally will be editing. You can do this by editing the bookmarklet.