>>>>> "Daniel" == Daniel Brown <dbrown@ccdc.cam.ac.uk> writes:

    >> Using -install also fails (but interstingly, running xlockmore
    >> in a window does 'the right thing' colorwise, but with a
    >> private colormap)...

What about '+install'? (This should turn off installation of own
colormap!?)

Otherwise you could turn off this feature via Xresources
(/usr/X11R6/lib/X11/app-defaults/XLock: XLock.install: off)

Markus.