Here are some steps to follow in the event Remote Desktop Manager crashes and you need to force quit the application.
Open your Windows Event Viewer.
Click Windows Logs - Application and validate there are no issues linked with the crash.
Launch Task Manager.
In the Processes tab, locate and End tasks on all Remote Desktop Manager applications that might be running.
Launch Remote Desktop Manager.
In the event Remote Desktop Manager still crashes at relaunch, try a portable Remote Desktop Manager installation.
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