I have also ran into the bug on Precise 12.04 LTS, which is really a
shame for an LTS release.
However, I have found a work around that resets the side pane for an
afflicted PDF file.
If you can not longer make the size pane smaller:
[1] Close the offending PDF if it is currently opened in evinc
Encountered when switching from financial to programming mode.
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Desktop Bugs, which is subscribed to gcalctool in Ubuntu.
https://bugs.launchpad.net/bugs/860821
Title:
gcalctool crashed with signal 5 in g_simple_async_resu