My xorg.conf is configured to use three monitors via two graphics cards and works with KDE.

(My) Fluxbox wont work with three monitors.

~/.fluxbox/init has configuration details for:
session.screen0
session.screen1

and these work fine on a dual monitor configuration with a single graphics card.

However adding:
session.screen2 configuration details does not make use of the third monitor.

Searching the web reveals lots of 'Fluxbox howtos' for dual monitor systems but not more than that.

My .fluxbox/startup file has:
xclock &

I had somehow accidentally removed the: &

Therefore the start up sequence for Fluxbox was not progressessing any further than xclock. After putting the '&' back again, things are now working as expected.

My .fluxbox/init file still needs to be configured to customise the third screen but currently, as I type, all three monitors are displaying separate Fluxbox desktops, which is what I want.

I don't know if there is a: 'Weekly LQ Dufus Award' but if there is, I would like to apply and at the same time apologise for this thread.