I have been notified by Canonical that there is currently a bug in casper - https://bugs.launchpad.net/ubuntu/+source/casper/+bug/984276
This affects remastersys users as you need casper for the live boot. I'll be keeping an eye on this as they work to correct the situation.
I have been doing a lot of testing on 32-bit precise and 64-bit precise and haven't come across this at all. I'm trying to get more information from Brian at Canonical regarding the issue. I am running the same versions of kernels and casper as is reported in the bug report but have not had any issues at all.