We have recent upgraded from Reporting Q2 2015 SP1 to Reporting R1 2017 SP2 188.8.131.526 and we are having an issue with report books. Anything that causes a refresh causes all of the parameter viewstates to collapse. If we fill them with pre-saved values and attempt to display the report book, they also collapse and rendering the book fails because no parameters can now be found. Not experiencing this issue with single reports, only report books.
Is there somewhere i should be looking specifically to address this? Using VS2017's debugger did not help much, only to show that the viewstates are gone before the first parameter is ever retrieved. Any insight would be most appreciated.