Re: When I click "Edit script",pops a strange windows.
If I'm not mistaken the qvsmanager.exe is a custom connector and belonged to the Power Tools 1.2 for QlikView. Normally there should be no connection between this tool and the desktop client unless they called this connector - is it used in your environment?
I assume that something is conflicting between this tool and the desktop client and the server maybe through failures by the installation or between different releases of them or any similar stuff like net framework, any security tools and so on.
Do reloads of these applications work? Does this also happens by a new created qvw with an empty script? If yes I would re-install the desktop client and if this don't worked you will probably need some more efforts to inquiry which releases are in use and if anything within the various Qlik and Windows log is odd.