I suspect that this is actually #467200. Briefly, race conditions mean that HAL will only sometimes be able to mount encrypted partitions. This should be fixed once the devmapper maintainers apply the patch attached to #455746.
Could you please try and confirm if this is the same bug? Once you have your system in the state where a mapping is created for the encrypted volume, but it was not mounted, can you run lshal and attach the output here? -- Sam Morris http://robots.org.uk/ PGP key id 1024D/5EA01078 3412 EA18 1277 354B 991B C869 B219 7FDB 5EA0 1078
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