EasyUAClient.Read o ReadValue returns null instead Subscription returns a value - by: sistemi@resdata.it

Hi,
we have a very simple UA client (like example demo code) that must read tag values from an opcserver.
Even when using demo application provided with QuickOpc installation, we're able to read values only when using "subscription" to a specified tag.
Instead when we try the read functions we receive a valid response with Status good and timestamps but a null value.
(see image in attachment)

Can anyone explain this behavoir?

If we use an other opc client like UA-Expert we're able to read single values and subscriptions.

Thanks
JZ