We are aware of an issue with mouse commands not being registered when in battle. This is due to the recent Windows 10 update that has started to roll out.
As a workaround, for now, we ask that you uninstall the update as it tends to resolve the issue. You may also follow this link to the Microsoft forums for instructions on how to proceed.
If you are still experiencing issues after attempting the workaround referenced above, please submit a ticket by clicking the link below for further assistance.