The first time you display a WorldCat record using a new user profile, the record window is not maximized in the client window.
The first WorldCat record displayed using a new user profile is a truncated view in the upper left part of the work area in the client window. To maximize the record window, use Window > Tile Vertically or Tile Horizontally. Once set, the window size will be retained.
Also, Window > Cascade will show you all of the windows (search results, records, etc.) you currently have open within the client.
This problem is listed on the known issues page.