Yes, through Performance, since often Drush doesn't quite clear all. No change.
I don't see why it wouldn't work assuming that your field names are field-tab1 and field-tab2. Did you check file permissions and ownership of the template files? They should be readable by the webserver.
If that doesn't work you can try poking around in the theme function with some debug code to see what is happening.
Thanks Anoop
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