GM:S 1.4 GMDebug.exe won't open

Hi, I'm using the Steam version of GM:S1.4 (v1.4.1804) on windows 10, and the debugger won't start with the game. The runner application starts as normal, but the debugger window itself never opens.
Code:
Attempting to set gamepadcount to 12
Start debug server
Creating Debugger server port:6502
[DbgServer]6502
Sound_Init()
Wave_Init()
Unable to find output device "null" defaulting to "BenQ GL2250H (NVIDIA High Definition Audio) via DirectSound"
Total memory used = 879823(0x000d6ccf) bytes
...Waiting for debugger to connect...
I've tried:
-reinstalling GM:S
-restarting computer
-disabling firewall
-disconnecting ethernet
-adding an exception in Avast for GMDebug.exe
-opening a different project
-opening the same project on a different pc (which worked, debugger started as usual)
-copying the GMDebug folder from my laptop (where it works) to my pc
-deleting the GMDebug folder and having steam validate files

As best I can figure, something is stopping GMDebug.exe from opening, but it's not Avast or Windows Defender.

Has anyone else had (and fixed?) this?
 
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