We've seen several ZCS 5-to-6 upgrades where the upgrade installer failed to upgrade the zimlets though the upgrade otherwise completed successfully.
We reinstalled the zimlets from the commandline and the zimlets then became usable.
Have not seen the admin console break as a result, but since we manually reinstalled the zimlets right after the upgrades, not sure we would have noticed.
Hope that helps,
Mark
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___________________________________ L. Mark Stone, CIO  "Uptime. All the time."
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