Thank you very much. If possible would you please submit the issue through Customer Care with detailed steps and queries you are running? Then we can track that issue in our internal system. Thanks. 

ARB toolbar bar with menu items gets greyed out when user runs a query, and that is the normal behavior. But after process complete they should come back enabled. Would you please provide more details about combination of OS and MS office version, as well as about particular query running on ARB so ...