Thank you for your message.
Could you please try updating both Host and Viewer to the most recent version 188.8.131.52
and see if this helps to fix the issue? You can update your Host and Viewer using the Simple Update
feature. In addition, please make sure that your Host and Viewer are both updated to the same version and there's no version mismatch because it might lead to some features not working or other performance issues.
Hope that helps.