[FIXED] AV Acess 4KSW41-KVM 4-port HDMI+USB KVM
UPDATE
I've determined that this behavior is not the fault of the KVM - It is something odd about the XFCE desktop installed by Armbian.
SUMMARY
Now that I've converted to the Armbian Minimal image (i.e., the CLI-only "default" image) the AV Access 4KSW41-KVM 4-port HDMI+USB KVM switch works faultlessly!
I've determined that this behavior is not the fault of the KVM - It is something odd about the XFCE desktop installed by Armbian.
SUMMARY
Now that I've converted to the Armbian Minimal image (i.e., the CLI-only "default" image) the AV Access 4KSW41-KVM 4-port HDMI+USB KVM switch works faultlessly!