How are you running the query (F5 or F9) would be the first question. F5 will pull the data as you would in SQL*Plus where F9 will retrieve the first X rows depending on the OCI buffer. When you say "doesn't retrieve any data", does it do anything? You also say it "hangs". Does it hang or does it simply not retrieve data? Does any dialog come up? Have you tried to spool the SQL (Database -> spool SQL) to see if any error is being generated?
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