Error message when opening Endnote X4

Hello there,

me and my colleagues use Endnote X4 for research at university.

From time to time I get the following error message when I open my Endnote X4 library:

"You do not have access privileges required to complete that operation"

This happend to some of my colleagues, too. I have to reboot my computer to get rid of this and be able to use EndNote X4 again. Does anybody know why this happens?

I use a university version of Endnote X4 if that makes any difference.

Warm regards,