After Exposing Form in a block in Views, then activating it (putting it in a region), the exposed form appears in the region where you put it. If you after that disable the exposed form (exposed form in block = no) in views, the block keeps on appearing in the assigned region. In the block settings page the block disappears, so you cannot disable it. You have to make it active first (exposed form in block = yes) in views, then remove it in the blocks settings page and then disable it again.
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Comment #1
merlinofchaos commentedYep, exposed form in block was not properly testing, and block.module doesn't test either, so it was just showing up.
Fixed this, and at the same time made it so some irrelevant exposed forms in blocks won't show up.