The "-n" option to xcompmgr made a difference... It behaves more "Normally" now, but the transparency goes away when certain programs are run like xfce4 terminal, or mplayer in the Root Window.
The workaround is to do it on a per-screen basis. (I have :0.0, :0.1, and :0.2), and set the DISPLAY Variable or display command line option, as desired. The test-program mentioned below appears as expected. > xcompmgr changed the root window. fvwm-root and xsetroot don't > appear to work. (But then the color or image will appear after > xcompmgr is stopped). The root window thing is still a little funky... > > > > > > El jue., 1 nov. 2018 15:21, <KopCam> escribió: > > > > > I have tried lots of stuff, too much to list at this time, > > > but the following test program has a transparent background > > > in XFCE and KDE. (On Slackware 14.2 64-Bit, NVidia Video Card > > > and Driver). > > > > > > > > > https://stackoverflow.com/questions/39906128/how-to-create-semi-transparent-white-window-in-xlib > > > > > > It does not work in FVWM, TWM, FluxBox, BlackBox nor WindowMaker.
