Thank you. When I attempted to replaced the wxLauncher SDL2.dll with the version from the 3/11/18 Nightly it generated a critical error and failed to start.
I think I'm using the latest beta but I'm not certain, there's no file version history on the exe.
I've confirmed I'm currently using 0.12.0-rc2.
*Nevermind* wxLauncher is a 32 bit application and I needed to drop the recent 32 bit SDL2.dll into it's BIN folder. I was dropping the one that came with the 64 bit build so of course it wasn't going to work.
I have the 32 bit 3/11 copy in the wxLauncher and 64 bit 3/11 in my game folder and they're happy. I'll leave this here in case anyone repeats this mistake.