I would not call this system too slow, i7 7700k, 16GB, SSD. This was all working before for a few years, only change was moving my hardware into a new cab. Still using the same buttons and pacLED64. So from a hardware point, nothing has changed, just its all in a new cab. I'll dig around on the pc and the BIOS as this does seem like some odd ball timing issue or something.
I still can't figure out why enabling debugging in LEDBlinky makes the issue go away. I forgot to mention but I am on the latest version of LEDBlinky as well. Done full uninstalls and re-installs of both LEDBlinky and LB/BB, same issue.
I am able to work around it about 95% of the time if I just don't run any animations and leave the LEDs off till mame starts, and then the buttons light up.
Kicker is this all worked fine till I moved it into a new cab...Love tracking down issues like this
