Missing DebugOutput of a background process started by windows service WXP vs. W7

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Dear all
I’m using DebugView from Mark Russinovich to view my messages send by DebugOutput. With W-XP I never had a problem, all “DebugOutput” messages where visible in DebugView.

Now W7: I have a background process (no GUI).

a.) In case I start this background process by double clicking in the explorer, debug messages are displayed in DebugView. Fact: If I start the background process by double-click from explorer, the process runs under the current account (“my account”).

b.) If I start the same process by the help of a service, no DebugMessage arrives in debug view.
Account in this case is “SYSTEM”.

c.) So I configured the service to run under “my account” to force, that the background process will also run under “my account”, in the hope DebugOutput will arrive in DebugView.

But unfortunately no DebugOutput arrives in DebugView.

What I’m missing, where I’m wrong?
Thank you very much in advance.