Thank you for the clarification.
Perhaps, the issue simply occurs because of the multi-monitor setup. Am I right in assuming that you use the 188.8.131.52 version of Remote Utilities? If this is the case, then could you please try updating to the most recent 6.12 Beta 2 version and see if the issue persists as it might have already been fixed in this release. The 6.12 Beta 2 version is available for the download on this page
When updating Remote Utilities, please make sure to update both Viewer and Host/Agent as the version mismatch might lead to performance issues and some features not working.
Please let me know if the issue persists after updating to the 6.12 Beta 2 version.