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Sorry it's taken me so long to respond to this (then again, you're 
anonymous, so I don't even know if you'll see this reponse :) 
 
I'm looking into the issue. Off the top of my head, I can't see any reason 
why *some* journal entries would disappear if the only change you've 
made is to add a new property. In the anydbm backend, the mutation of 
the schema has no actual effect on the data stored. It certainly shouldn't 
result in the loss of item journals. 
 
As I said, I'm looking into it, but if you find any other information / 
behaviour that you could supply, please do!