"I'm in a halfway state with my AE2 system, meaning I'm having it collect ores I dig up but not sending it out for processing.
I'm currently storing all copper and tin in JABBA barrels (tested with a chest too) configured with a storage bus and an export bus
The storage bus allows insertion of TE ore and extraction of course, the export bus has a fuzzy card set to the same ore (copper export on copper barrel).
All ores work fine, except the mekanism copper/tin. I configured the fuzzy exports with the mekanism ore and all other oreCopper works, just not the mekanism ore. Removing the fuzzy card works, pushing out the mekanism ores fine, but then no other copper ores are pushed through.
I have my own modpack, hence why the multiple coppers." (As I posted on AE2 issues page)

On the AE2 issues page, someone speculated that mekanism might be oredicting too late, so could it happen earlier or would that not fix the problem?

Mekanism registers all its OreDict stuff as early as possible, sorry.