First, I hope this forum is OK, there is currently no Datazen specific group.
I've performed a standard single server Datazen installation and configured all services to use a specific domain account. When I publish a dashboard which includes a parametrised SSAS based dataset the thumbnail for the dashboard is not generated. For non-parametrised queries there is no problem.
I have tried modifying the default parameters at both the data set and dashboard level with no success.