Split File Error!

Howdy. I am practicing installing BPC 7.0 on a development box to ensure that our eventual production upgrade will go smoothly.

I've followed the upgrade document by uninstalling BPC 5.1 and installing BPC 7.0.

I have a fresh client on which I installed the new administration client. I connect to this development server, open dimension library, click on time, click maintain dimension property, and then modify dimension property. But an error pops up that says:

Split File Error!!

Cannot save member sheet to the server; do you want to save it to the local machine?

None of my searches have turned up a thing. Any ideas on what to look at?