Hidden line in chart - diffferent display in VS and RS

Hello, i have a Problem with a Report with Charts in it. I added a derivedseries in a Chart to make the average visible. When i start the Report in VS Studio 2010 everything in fine, but after upload to the reportserver (in MS CRM the same) the line have other Color and hidden Labels are visible, in one Chart are only the Labels, but no line... Very mysterious things? Has anybody a idea what can be the Problem?
I don´t find any option to upload Pictures in this Forum? Ho can i do this?

Stefan

VS 2010 / SQL Server 2008