Mamehooker Won’t Send Serial Commands

[jorgenjl2]

For the life of me I cannot get mamehooker to send serial commands. If I open Mamehooker, go to systray > test > and enter “cmw 4 Hello_World” the Arduino ide serial monitor shows nothing. I have my Arduino code perfectly setup to turn on my led strip if I send “6.,1,x” and turn off if I send “6.,0,x” through Arduino ide serial monitor. But no matter what I do Mamehooker sends no commands. Outputs looks great in debug window in mamehooker (when Mame is not run as right click admin option) for dig dug and sfrushrk, I tried with and without opening as admin, restarted pc, verified ini’s are set to output windows (and non-elevated cmd prompt with cd <Mame folder>, “Mame.exe -output windows” just in case),  I verified com port 4, went through guides again, etc. Yet simple com commands do nothing. A driver issue? How to troubleshoot further?