When you set the Locale option to English (United Kingdom) on the Regional Settings page in Microsoft PerformancePoint Services, and then you select the decomposition tree in the dashboard, you receive the following error message:
An exception occurred while analyzing a cell in the Decomposition Tree.
Note This issue occurs after you apply the hotfix package that is described in Knowledge Base (KB) article 2597069.
To resolve this issue, apply the following update:
2597936 Description of the PerformancePoint Services for SharePoint Server 2010 hotfix package (Ppsmawfe-x-none.msp): February 28, 2012
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.