BUG
A map layer is made transparent but disappears when printed or exported.
There are two methods of making a layer transparent. If the transparency is set using the Layer Properties > Symbology tab > Advanced button > Transparency setting based on unique values and the layer has many unique values, that layer disappears on output.
1. Right-click on the Layer in the Table of Contents and select Properties.
2. Select the Symbology tab.
3. Set the Symbology type to Categories.
4. Click on the Advanced button in the lower right hand corner of the dialog and select Transparency.
5. Click the Field dropdown list and select the attribute field to base the transparency on in percent.
1. Right-click on the Layer in the Table of Contents and select Properties.
2. Select the Display tab.
3. Enter the percentage transparency in the Transparent box.
Article ID:000007648
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