This bugs is perhaps related to this one : 
http://sourceforge.net/mailarchive/forum.php?thread_name=42957.128.178.193.179.1172267794.squirrel%40www-mail.magbio.ens.fr&forum_name=qucs-help

In both cases, the bug (crash or invalid data) arises after the diagram
dialog is called and the OK button clicked.

I experimented the same problem as described in the link above. With the help 
of Stefan Jahn (leader of the qucs project), I tracked down the bug, and it has 
to do with an unforeseen call to setlocale in /usr/lib/libscim (called from Qt) 
which changes LC_NUMERIC from "C" to the platfrom language ("FR_fr" in my case).
The problem is that the data files are not correctly read after the change 
(hence the <invalid> label for the axes, and perhaps crashes in soe cases ?).

Note that the bug appears only if the decimal separator (configured by
LC_NUMERIC/LC_ALL) is different from a point (a coma infrench an in
other countries).

I join a patch against qucs-0.0.11 which cleared the problem for me.
Note it's a "quick and dirty" solution. /usr/lib/libscim sould probably
not change the locales during its initialization.

** Attachment added: "Patch to cure setlocale problem"
   http://librarian.launchpad.net/7319426/qucs-0.0.11.diff

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https://bugs.launchpad.net/bugs/71410
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