Joerg:
Just to let you know I experienced the same error on a test laptop using Excel 2010 this weekend; since I have Analysis 2.0 working on a machine with Excel 2013 I won't submit an incident but if you get a fix for this would you please report back here?
I suspect it is a registry setting or something to do with .NET or VSTO (my guess)
Thank you,
Tammy