There was a recent Service Update applied by Microsoft to our Dynamics 365 CRM instance and since then any SSRS Report Parameter that is prefilled by a Dataset Query is refreshed back to the default option when View Report is pressed.
It seems to happen when there is a Postback refresh function that occurs with the pressing of the View Report Button.
I have logged a Support Ticket with Microsft but as yet they haven't been able to resolve this issue.
I can provide more information but was interested to see if anyone else is experiencing this issue and if so, have they been able to resolve it.
Any assistance would be appreciated.