No data fields are available in the OLAP cube

i was able to access data in Excel yesterday, but now all the cubes that i have created cannot be accessed by Excel any more and after authenticating and selecting the cell for the pivot table i get this error:

No data fields are available in the OLAP cube

i just hope this is some process in HANA that needs restarting and not some endemic MDX problem. if so, where do i look?

has anyone seen this?

BTW, shouldn't there be a single log on for the connection? i have to enter credentials twice: 1 when creating the connection and 2 when opening the pivot table.