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The following error message occurs several times, when attempting to change the symbology for any data layer drawn in an ArcMap document:
"This port is already used! Do you want to restart?"
Interference is coming from the Brownie software utility. Brownie is a Brother utility installed with Brother printers, including the HL1470N.
A Web link is available in the Related Information section providing a description of the Brownie utility.
Uninstall the Brownie utility. For instructions see Related Information section.