Hi Stewart,
You do not say what the new computer is , what operating system and browser you are using. IF you are using the 64 bit versions of Vista or Windows 7 and the 64 bit version of IE9 then there is a known problem that was pointed out by “Steambuff” on another thread on this forum. (Back at last !) If this is your setup then setting IE9 to compatibility mode solves the problem. Using Firefox instead of IE9 also solves the problem.
Les