I have the launchpad mini running with mlrv with no problems–using the mlrv launchpad built in configuration.
After some head scratching, I also finally got monome sum working with the lp mini, this time running as an emulation via sigabort’s gridlock (linked above). However, all of a sudden the MLR inside sum stopped working. I’m not sure if this was due to a max update or what. (I use the free max runtime, or demo as I believe they call it now.)
Questions on any of the above let me know and I can provide more detail.