Endnote CWYW add-in prevents opening word docs except through already open word program

Vista (32-bit), Endnote X1 (updated with all recent patches).

After I installed endnote when I try to open a word document through double-clicking it tells me that it can’t find the specified file. But when I try to open the same document though word (e.g… Open word first then select Open and browse to the file) it works fine. When I installed Endnote and disabled CWYW add-ins it worked, but when I enabled the add-in the same problem started again. The problem happens only with some files, but I can’t figure out what differentiates them…Any ideas?