I'm using CustomOreGen 1.2.21 and Mekanism 1.7.10-188.8.131.52 and BiomesOPlenty1.7.10-184.108.40.2066, along with a bunch of other mods that don't do anything funny with oregen. I haven't touched the config files for COG, just using the defaults and there's NO Mekanism ores being generated at all. I verified that the Mekanism config exists, and aside from low (but not missing) quantities of redstone and coal, everything else seems to be generating just fine :\
Is there a known compatibility issue with these versions? Am I just missing something?