Seems to be fixed in lyx 1.6.5 in Lucid.
** Changed in: lyx (Ubuntu)
Status: New = Fix Released
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lyx 1.6.4 freaks out, consumes all memory, is killed by OOM killer
https://bugs.launchpad.net/bugs/494092
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Bugs, which
** Attachment added: Dependencies.txt
http://launchpadlibrarian.net/36595081/Dependencies.txt
** Attachment added: XsessionErrors.txt
http://launchpadlibrarian.net/36595082/XsessionErrors.txt
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lyx 1.6.4 freaks out, consumes all memory, is killed by OOM killer