Привет!
To be honest I do not know the reason of this strange behaviour...
I know that for A1200 Mediators there was a must to upgrade MACH chips with never version to have extra features (more card support, better stability).
But if Mediator is new it's not the case.
I'm sure you have sent an e-mail to Elbox about that.
What was the reply from them?
This is the site where my friend described Mediator installation:
http://www.amiga.pekdar.net/amiga/index.php?artid=89In Polish, sorry but you can use Google translator.
Пока!
Станислав