Thanks a lot nwoolls,

what an great a tool. Works on my Windows Machines like a charm, having no problems at all right from the start even with the early versions.

Why not using it on my iMac, I asked myself. Everything installed, no problems starting it on iMac (2011, Lion), Coin Configuration o.k.  - but unfortunately MultiMiner doesn´t detect my GPU. Mining Scrypt Coins with Diabolo or Bitcoins with guiminer (or Bitminter) works just fine.

Any ideas? Are there any iMacs out there causing similar trouble?