Sorry to hear the bug was confirmed but thanks for the update as I was wondering how things were progressing. You didn’t mention what version of Endnote you’re using, but did tech support indicate the bug is isolated to Endnote X7?
In order to bypass importing PDFs into Endnote X7 am wondering whether using an earlier version of Endnote such as X6, would enable proper importing and storing of the PDFs. If so, then the Endnote X6 library with the PDFs could be exported as an .XML file which in turn would be imported (the .XML file) into Endnote X7. Don’t know if you have the time or inclination to test it, but otherwise you might try asking tech support if they could perform the import for you or fix your database given that they can’t give you a definite time frame for a fix.