Ok, just to make sure that there are no more issues, here is a 184.108.40.206 build for you to test before we officially publish it. We did quick in-house testing and didn't find problems, but your feedback is welcome:
UPD: The new version has been published. Download from the download page
Note: If you have issues updating Viewer from 220.127.116.11 to 18.104.22.168 (e.g. error messages), then manually uninstall the Viewer first using the Windows Control Panel and delete the file config_4.xml that you can find in C:\Users\username\AppData\Roaming\Remote Utilities Files\. Then install 22.214.171.124.
Also, Offline/Online problem is no more both on 6.5.x.x and 126.96.36.199.
Looking forward to your reply.
P.S. It is also recommended that you upgrade your RU Server after you update the Viewer, although Viewer 188.8.131.52 must work with Server 2.5 without a problem.