U3818DW, not switching inputs, DDM 1.4.0.1942

Attempting to use DDM 1.4.0.1942 to program hotkeys to enable switching back and forth between my work laptop and my home PC, both of which are connected to my U3818DW with M3B103 firmware.

My goal is to use one keyboard and one mouse to control both my work laptop and my home PC, using programmed hotkeys to switch back and forth between inputs.

Specifications are as follows:

"Work" Laptop - Lenovo T430 running Windows 10, connected to U3818DW via USB-C.

"Home" PC - Custom build w/ Gigabyte Aorus Master mobo & AMD RX 570 graphics card, running Windows 10, connected to U3818DW via HDMI_1 and USB_1.

DDM 1.4.0.1942 is installed on my PC, but not on my laptop - I was under the impression this was OK.

When I assign hotkeys to switch between computers via the DDM software, I can successfully switch from the PC to the laptop, but cannot switch back. When I manually change the U3818DW input source via using the buttons on the U3818DW itself, I return to my PC to find that the screen is blinking black approx every 5 seconds. This persists until I restart my PC.

Any help with this would be appreciated. Thank you.