I asked in the iRex forums and they told me that about 1% of users who upgraded to 2.9.5 experienced the problem. I decided I could live with those odds, especially as I hadn't installed anything extra yet and made sure to fully charge the battery and have the iLiad plugged in before I started the update. I admit to feeling a bit nervous anyway, but everything went fine.
They also said this was an unusually difficult upgrade because of changes they'd made to the kernel. I know enough about how kernel patches can go bad after 11 years at Sun to have some sympathy, both for iRex and for those customers who did get bitten on this one. Speedy flight to all iLiads who needed to make the round trip! Hopefully we won't have much of this in the future.
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