Why do I get the error “kwm: it looks like theres already a window manager running. kwm not started”?
You are running another window manager before KDE is started. Make sure you are using startx to start X, and not startxwin.bat. Also make sure that you have exec startkde in your .xinitrc and not, for example, exec twm. This error also appears after changing and applying KDE themes, caused by Cygwin’s incomplete emulation of the Unix-style environment. This may possibly be fixed in one of the later Cygwin beta releases. A workaround is not to directly apply a theme, but instead confirm the changes and restart the whole KDE desktop.
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