Hi Fed, have you set the Persist = False in "networks\freicoin.py". I have uploaded a change. I tested it and it works now! Also with merged mining with my coin (www.winc-ev.jimdo.com) its mining blocks for both coins. So i would conclude merged mining works (Freicoin as parent - should also work with devcoin at least). Waiting for your test results ;-) Rik