I have the normal BOINC manager icon in the dock when it is running. It then puts another icon there for Rosetta. After a while, I end up with multiple Rosetta icons.

Is there a way to resolve this?

This are the graphics icons. This happens with Leopard and the Rosetta and older Minirosetta applications if the graphics (via screensaver or show graphics with the BOINC manager) would be started and finished. The newer Minirosetta Applications has fixed this.
The only workaround I have found is to stop the BOINC manager and start it again.

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