Le 06 Mar à 15:51, Paul Davis ecrivait: > what same XWindow problem? This one : The program 'fst' received an X Window System error. This probably reflects a bug in the program. The error was 'RenderBadPicture (invalid Picture parameter)'. (Details: serial 55944 error_code 189 request_code 155 minor_code 7) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the --sync command line option to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.) It occurs randomly after a short use of the GUI of *any* VST I have used so far. The same VSTs can be used for hours without any problem with jack-dssi-host. I'm sure that many other people encounter this problem, for example this guy : http://bugs.winehq.org/show_bug.cgi?id=6673 I have already described this problem in an e mail here : Date: Fri, 1 Dec 2006 12:37:27 and I had no answer. I have talked about this two times on #ardour and there was immediately someone to report the same problem. > these plugins have no GUI - the host has to build one. FST doesn't do > that. Ardour does, and I thought that JACK-DSSI did or could as well. Thanks for this precision and for the other answers. Best, Y.