I've set up a lot of PCs with LB/BB and usually have few issues, but occasionally I run into one where this happens, and I can't figure out why.
I've tried uninstalling and reinstalling LB, uninstalling and reinstalling RA, but no dice. The path is pointed to the correct location for RA and my roms, and they launch fine in RA stock. But when I try to run them in LB, nothing happens. This is the case with all roms for all consoles.
One oddity I notice is that sometimes LB tries to launch a game with the wrong RA core. I'm not sure if this is a setting in LB or RA, though.