Your title does not clearly specify your problem. Is your computer
freezing in general or does only X freeze(try Crtl+Alt+Backspace if it
happens again). If your problem is only with X, please provide us your
~/.xsession-errors.
You mention too in your title 'unexpectedly closes applications' and in
the report very much data about 'yelp', if this problem is not related
to the other one, please open an other bug report for it.
** Changed in: ubuntu
Status: New => Incomplete
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computer freezes and unexpectedly closes applications
https://bugs.launchpad.net/bugs/258347
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