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Hi Terry,
The engine.log should contain logs regarding ISO files,
can you please attach it to the mail, maybe we can find some clues there.

Regards,
Maor

I am attaching what I think you're asking for: /var/log/ovirt-engine/engine.log

Near the end of it, I do see this:

2012-02-24 13:49:28,795 INFO [org.ovirt.engine.core.bll.IsoDomainListSyncronizer] (pool-5-thread-48) Finished automatic refresh process for Unknown file type with success, for storage domain id 48a5390f-2f86-485c-8537-b6bc9dd71796.

Perhaps that's relevant.