Thank you for your message and the provided log files.
Could you please try updating your current Remote Utilities installation to the most recent 6.12 Beta 2 version for Host and Viewer and 2.9 Beta 2 for RU Server and see if the issue persists after the update? We have implemented a few improvements and bug fixes, namely, we fixed some issues that could make RU Server freeze during custom server security authorization, so the issue you're currently encountering might be already fixed in the Beta version. For the full list of release notes please see this page
Version 6.12 Beta 2
for Viewer and Host and version 2.9 Beta 2
for the RU Server are available for the download on this page
When updating Remote Utilities, please make sure to update both Viewer and Host (as well as the RU Server) in order to avoid version mismatch that might cause performance issues or some features not working.
If needed, before updating your current installations, you can try using Portable Viewer
Please let us know if the issue persists after updating Remote Utilities.