CNVPutDataInBuffer and CNVGetDataFromBuffer reads old data

I'm using CNVBufferedWriter and CNVBufferedSubscriber to write/read a shared variable. When I write data to a scalar variable it works fine. I see the new value in NI-DSM.

But when I write data to a structured variable and read it back, I always receive the old values. All functions return "0" (success).

Please help!