Thanks for your suggestion but I should have stated that although I am connected to a network I am working on vi's local to my PC so network security should not be the problem.
I can confirm that I see this problem for all vi's that I try and edit that where created before I changed my passord !
Hi, Then i think its got to do something with your password change,so why dont you try onething,now create a new VI and change your network password again and try to edit this VI,check if there is any problem then it is with your network security .