sql server reporting services: I have a table that has groups and group headers that start on separate
pages for each grouping. When I add a 'visibility' filter the page breaks
for different groups no longer work. Is this a bug in SP1?

Yes, this is a bug. We had originally intended to ignore page breaks on
items with toggleable visibility (i.e. drilldown) since it was complicated
to implement and would likely just confuse users to have drilldown suddenly
mess with the number of pages in the report. But we inadvertantly also
strip page breaks for items with conditional (expression-based) visibility.
I don't know of a workaround.

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