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When you run an X program from a terminal you can see any errors. But when it's run from another X program (eg from a menu item, from your fluxbox 'keys' file etc) it might just die and you see nothing (except perhaps in .xsession-errors). Instead, launch it via this command and you'll see the termination status, stderr and stdout.
eg: "xlaunch firefox" or "xlaunch 'echo stdout; echo stderr >&2; false'":
'echo stdout; echo stderr >&2; false' failed with error 1
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