It picks up from tnsnames.*
Never had a problem with refresh. I think it checks last modified time.
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Probably because you have more than one tnsnames* files in your directory.
Most folks don't realize this, but SQL*Plus has the same behavior. If you have a .BAK copy/version, rename it with a leading 1 or something in FRONT of the 'tnsnames' bit of the filename.
Thanks for quick replies. Changed some old tnsnames.ora.xxx files to bak.tnsnames.ora.xxx
Only one showing now.