BPC 10.1 admin client error

Hi,

After installing SAP BPC 10.1 MS I encountered following error. For some reason in admin client after pressing "Maintain dimension members" -link I get greyed out Excel. Strange thing is that approx. 50 % of times it works ok and for other half it does not. I've tested in two environments and in both I get the same issue.

1. Windows 8, Office 2013 32-bit, EPM-addin Sp20 .NET4

2. Server 2012, Office 2013 64-bit, EPM-addin Sp20 .NET4

Any ideas?

Tommi