If possible I recommend you to upgrade to QlikView Server 9 SR6, as there are many bugs corrected and features added. Since set analysis is one of the features improved in version 9, it's possible your document has to be loaded in version 9.
Check for here for available downloads.
Thanks for the reply. I just wanted to what would be the impact of upgrading the qlikview server from 8.5 to 9. Will it cause any problems with the exisiting reports and data? I am not sure of it.
I would need to convince my network administrator that all the reports would continue to function correctly without impacting. Where can i get details regarding server/publisher upgrade process?
On another note, wasn't there a feasibility to do the year to date and month to date calculations without set analysis?