Object reference not set to an instance of an object during navigation

Hello,

We are facing a problem when navigating in a bex query through MS-Anlaysis.

We add an caracteristic and everything is fine, but then when we push the back button, we are being disconected and have the error:

     Object reference not set to an instance of an object

We run Analysis 1.4.6.2960 with Office 2010.

This error occurs when I had the profit center above Key figures (which leads to an increase of lines from 295 to 29990). It does not happens when the profit center is added below (which leads to an increase of lines from 295 to 546).

Could it be a cache problem?

Thanks,

Jean-Guillaume