I don't use fluxbox so I'm generalizing here.
Quote:
Could fluxbox overlaying or something be different in Slackware?
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Since Fluxbox is a window mgr and Nitrogen is a background browser the the X window system it sounds like it's a compatibility issue.
If running startx gives you a flickering screen than your run level doesn't have a gui or might be misconfigured. (hard to tell)
What is your run level set to in your /etc/inittab file?
Did this start happening after you installed Nitrogen?