SSRS Report name issue..

Hi

I am creating a new ssrs report.

When I give the report name in Visual Studio as "Forecast" its displaying empty  report.

When give the report name as "Report1" its displaying empty report for first time and data is displaying properly  when I run the report for second time.

I"ve tested this name issue multiple times but its giving the same problem every time.

DP class is working fine.

Can anybody help me on this??

Thanks,

Ashish