Synonyms don't appear in list

Have created a number of synonyms for a schema but they don’t appear in the list under the schema browser. They are active, am using them in PLSQL. How can I make them visible?

I have had issues with this also. The causes are related to the settings in the Synonyms filter. My settings are:

Synonym Type: Private and Current Schema Only are checked
Object Owner: Any Schema checked
Order by: Syn Name Asc Checked
Object Types: All types are checked with Either checked for DB links

Particular the first two must be selected carefully to obtain the list that you want.

HTH,
Dave