Am running the same...AMD64 but the crashes have stopped...which kernel version are you running...I guess its been rectified in the 2.6.xx.17 version... check it out :)

2008/5/26 Manca <manca1@gmail.com>:
I can confirm that this bug exists on Hard x64 and it's sooooo annoying!
Opening couple of flash sites crash npviewer immediately !

And I am running Inte Quad core CPU!

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npviewer.bin crashed with SIGSEGV
https://bugs.launchpad.net/bugs/141613
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My Fingerprint:1024D/45CA88FF

The box said Windoze or better,so i installed Linux
Registered Linux User #46760