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Some or all halos in a map disappear when exporting to any ArcMap format. Printing is unaffected.
The default printer may be causing this problem.
ArcMap requires a hardware device context, or HDC, acquired from the printer, for all display and output. When exporting, ArcMap uses the HDC from the default printer on the computer. Sometimes, the default printer's HDC may cause problems, particularly with halos. This problem has been seen to occur most frequently with printers that are known as multifunction printers, such as Savin printers.
There may be other reasons why halos are not exporting and the following workaround may not work in all cases.
Change the default printer to a non-multifunction printer.
This problem may also be resolved by downloading and installing the latest printer driver from the printer manufacturer. However, if that does not resolve the problem, use the above procedure.