DWDataReader - DWIGetScaledSamples Error

I'm using DWDataReader v5.0.8, in a compiled C++ dynamically loaded module.  

When I run: 

DWIGetScaledSamples(r, ch, pos, count, y, t)

and in the Setup/CAN the "Store Decoded" box is checked everything runs fine. The time vector and the signal data are returned via the pointers supplied, error value returned is 0 (DWSTAT_OK).

If I have the same data file, but the "Store Decoded" box is not checked, the results are different.  

Calling DWIGetScaledSamples(r, ch, pos, count, y, t), an error is returned (DWSTAT_ERROR_CAN_NOT_SUPPORTED = 10). However, the time and sample pointers still point to the proper data! Ineffect, everything "worked", but an error was returned anyway.

Am I missing something or is this the intended operation? Is there a reason an error is being thrown when requesting scaled data from a CAN channel?

I tried to post this is the developer forum, but after clicking submit the box went grey and nothing else happened.