We are migrating from a Sharepoint 2010 environment to a Sharepoint 2013 environment.  We have PerformancePoint dashboards that display fine in Sharepoint 2010.  In the PerformancePoint 2010 environment, the dashboards were developed using the v4 master page.  Now in the 2013 environment, the default is Seattle.  Most of the dashboards display similarly (although a little differently) in Seattle as they did in v4.  One of the features of PerformancePoint 2013 is that you can use the default master page to keep your themes in your dashboards.  However, when we change from page layout Seattle to page layout Oslo, the dashboards do not display correctly at all when using the default master page.  Has anyone experienced this and if so, do you have any suggestions?

We are seeing the exact same issue.  Were you ever able to find a solution to this?  We have a custom master page applied to all new pages, but the PerformancePoint pages do not inherit the master page setting.  So far the only way I can seem to resolve is to edit each page in designer which is a pain.