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From: Lowell Gilbert <freebsd-ports-local@be-well.ilk.org>
Date: 20 Mar 2005 10:56:55 -0500
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Subject: Re: Qt applications hang
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Francois Tigeot <ftigeot@wolfpond.org> writes:

> If I use X11 forwarding with 'ssh -X localhost' and log as myself, I get a
> lot of errors in the controlling xterm such as these:
> 
> 	X Error: BadWindow (invalid Window parameter) 3
> 	Major opcode:  7
> 	Minor opcode:  0
> 	Resource id:  0x49
> 
> However, the application is perfectly functional. File/Open in scribus
> opens a dialog and does not freeze the application window for example.
> 
> If I change the window manager in ~/.xinitrc, I don't need to use the ssh
> trick. With KDE's wm or a sole xterm Qt applications run fine.
> 
> I am now pretty sure there is something fishy with windowmaker.

It also sounds like  X11 security is involved.

It might help to try the ForwardX11Trusted option with ssh.