if you have individual report suites with local currencies (US stores in $, German stores reporting in EUR, British in GBP, Canadian in CAN, you get the idea)
when added to a rollup, the individual local revenues do not get converted, all that changes is the currency symbol. Site revenue of 100 EUR becomes $100 resulting in the rollup revenue numbers to become useless.
This effects every client who has more than one currency and uses roll-ups (and yes I know about multi-suite tagging and I do that too, but roll-ups do have their use)
Engineering Services claims this is an enhancement, that's why I am adding as a new idea, although in my world view this counts as a bug