I have the same issue, and today discovered a workaround: launch BlargSNES with FBI (look for title CTR-P-BLRG) and it works! Still just hangs on a black screen if I try and launch it from the home menu though.
(I'm on O3DS 9.2 rxtools linked emunand)
(oh and 1.3b is just a hotfix for the 2.5...