pasting into the minibuffer

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Hi,
 I can't paste using Ctrl-Insert(or yank using C-y) into the minibuffer to 
insert the target for an I-search, but I can do so into a query-replace. 
I've hunted and poked around in the documentation for a reason for this, but 
I have yet to find an answer. Can anyone tell me why, or what I might be 
doing wrong?

TIA,
 Mike

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