Yeah, i've got the same/similar problem as well. I open a game, SLProxy boots up and logo pops in taskbar and either LB or Steam closes
Pasebin: https://pastebin.com/fgqhfKUQ
Windows Version: 10.0.19045 Build 19045.3448
System Type: x64
LaunchBox Version: 13.6
Steam Version: 1694466342
Steam API Version: SteamClient020
SteamLauncher Version: 0.9.8.5