Yes, we definitely plan to release a stable version of Viewer for Mac/Linux with more features as well as Host/Agent for Mac/Linux in the near future. Unfortunately we cannot provide any specific ETA on these releases yet, but we'll do our best to make them available as soon as we can.
Could you please try enabling the Use legacy capture mode feature in the Host Settings -> Other tab and see if this helps to resolve the issue? After enabling the feature please restart your Host in order for the changed to be applied.
In addition, please double-check if the rfusclient.exe file is present in the Host installation folder C:\Program Files (x86)\Remote Utilities - Host\* as the issue might be occurring in case if rfusclient.exe was accidentally removed (for example, by some antivirus software). In case if the file was indeed removed from the folder, then please try re-installing Host and make sure to add the Host installation folder to the antivirus exception list as described here.
Last but not least please make sure to update your RU installation to the latest version 18.104.22.168 - it's available for download on this page or via Self-Update feature. When updating please make sure to update both Host and Viewer to the same version in order to avoid the version mismatch.
Do you mean that you want to print a remote document on a local printer? If this is the case, please double-check if you have Printer driver installed on your Host machine - you can locate it as Remote Utilities printer in the Windows's Devices and Printers window. Alternatively you can also check this in the Host Settings -> Driver tab - if the virtual printer driver is not installed, i.e. the "Install" button is active, then you can install it by simply clicking the same "Install" button - this will automatically install the printer driver on your Host machine. Here's also a guide on the Remote Printing feature that might be helpful.
Please note that in case of using the non-installable Agent the remote machine and Agent itself are only available for connection as long as Agent is running. Therefore, you can simply close the Agent window - this will disconnect any currently active sessions and no Viewer will be able to connect to this machine until you run Agent again. For more information please see this page on connecting via Agent.
Please note that the CPU usage value you set in the Connection Properties - Color and CPU tab affects remote sessions with this specific Host since it might be specified to different values for each connection. In this case, we would recommend that you test out a remote session with a default CPU feature and then adjust it accordingly to better match it with your configuration. Perhaps, this KB page might additionally provide some helpful information.
Seems that you were correct in your original post and the issue is caused by something in the address book file. I'll forward the issue description and the error log you've provided to our developers and will ask for their input on this.
I'll get back to you with an update from them as soon as possible.
Am I right in assuming that your Viewer was updated from version 22.214.171.124 or was it an older version? As for the current issue with Viewer - please try uninstalling Viewer completely as described in this full uninstallation guide and then re-installing it from scratch to see if the issue persists. Before uninstallation please locate and copy the following files: 1. config_4.xml file in the folder C:\Users\[Your_username]\AppData\Roaming\Remote Utilities Files\ which stores Viewer's configuration settings. 2. One of the most recent backups of your address book in the backup folder \%AppData%\Roaming\Remote Utilities Files\backups\. After you've re-installed Viewer from scratch, try pasting the configuration file to the same location and restoring your adder book from a backup as described here.
Could you please clarify if you see the remote Host as offline in your address book or if your connection is stuck at the window with a "world map"? In addition, could you please double-check if Host is running at the remote machine, i.e. that you can locate its icon in the system tray?