There looks to be an issue with MTQ in 10.2.
Looks like its best to ensure FP1 is applied then add MTQ.SingleCellConsolidation=false to your cfg
http://www-01.ibm.com/support/docview.wss?uid=swg21664467&myns=swgimgmt&mynp=OCSS9RXT&mync=E
Blog of IBM Cognos TM1, Cognos BI, Cognos Express, CDM and other related stuff.