For example:  click on an attachment like "Thu Aug 23 20:07:00 +0000 2007:
OOo2.3M1 calc stock.ods" in "Issue 80959", from within Firefox.

This displays okay.

However, if I then click on a menu item with the 'Command' property of:
>>>
    /opt/ooo-dev2.3/program/soffice -swriter %u
<<<

Nothing shows up, certainly no instance of OOo is displayed.

Similarly if I execute:
>>>
    /opt/ooo-dev2.3/program/soffice -swriter
<<<
in a terminal, nothing shows up,- no warning, no error, and no diagnostics of
any kind.  Even if I repeat, after deleting the tab with the Calc document
displayed.

I noticed there is an 'instance' of OOo runing:
>>>
# ps aux | grep soffice
gavin     8120  0.0  0.0  63788  1148 ?        S    13:50   0:00 /bin/sh soffice
-nologo -nodefault -accept=socket,host=0,port=8100;urp
gavin     8132  0.3  1.7 232260 70180 ?        Sl   13:50   0:02
/opt/ooo-dev2.3/program/soffice.bin -nologo -nodefault
-accept=socket,host=0,port=8100;urp
root      8489  0.0  0.0  61120   720 pts/3    S+   13:59   0:00 grep soffice
# 
<<<

If I terminate with 
>>>
# kill 8120 8132
<<<

Then either clicking on the menu icon, or running from a terminal works.