I am unable to insert items with special characters (tested: ü,ö ä and ß properly broken too)
in my target crafting encoding field.
Might be a minor bug because it only affects target crafting block,
not the crafting recept or target processing fields.
When switching to english encoding works fine and theres no crash when I switch back to german,
even auto crafting works like a charm.

Used Seeds and Mekanism's Steel Chasing because of ("Körner" and "Stahlhülle")
Also used a "ME Pattern Terminal", I did not test others so far.

Minecraft: 1.7.10
Forge: 10.13.4.1614
AE2: rv2-stable-10

(My first issue report, hope everything is fine)

EDIT: I am using OS X 10.11.5

Can you also reproduce this in the latest version (rv3-beta-6)?

RV3-beta-6's auto-detecting works fine for me, but it only used to affect the target field, which is irrelevant now.
So this remains a RV2 issue.

RV3-beta-6):

As reported to be fixed with rv3.