Endnote X8.0.2 on windows 10: Can't search for texts within PDFs

whenever i do a search on a whole library to try to find which source contains a particular word (by searching “PDF”, and keyword e.g. “oxidation”), Endnote always return an error: “No matching references found” which is totally not possible! Majority of my sources has their PDF attached, and they are text based (and not image scans). This function used to work previously. Is there any option that I have to enable somewhere?

I would suggest contacting support.

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The other things to try would be to Recover your library or reset the EndNote preferences.