I'm very sure there's no other hash references in there. I double checked that. I don't know anything about read only flags, so I suspect it's not that.
I'm going over everything again, and haev even sucked a colleague in, but I've stumped him as well.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.