Upgrading forms to Developer 6

I have recompiled Forms 5 forms to run on Developer 6.
Within Developer the forms run, but when I try to create a shortcut on the desktop and launch the first screen I get a message saying this was created with a new version. I do not get the LOGON screen. I am not familiar with FORMS and have inherited a system with no documentation that has to be up and running on Developer 6. Can anyone advise me what the problem could be?

Thanks for any advice.