https://bugs.winehq.org/show_bug.cgi?id=43045
--- Comment #4 from Alistair Leslie-Hughes leslie_alistair@hotmail.com --- Thanks.
From the log
fixme:ole:CLSIDFromProgIDEx L"MendeleyWordPlugin.PluginComServer.1",0x32bd70: semi-stub warn:ole:clsid_from_string_reg couldn't open key for ProgID L"MendeleyWordPlugin.PluginComServer.1" trace:ole:SysAllocStringLen (null)
.... trace:ole:ITypeInfo_fnInvoke [retval] value: 0x7a63ec8 {VT_DISPATCH|VT_BYREF 0x32c4d8} warn:ole:ITypeInfo_fnInvoke invoked function failed with error 0x80070057
... fixme:msxml:domdoc_setProperty Unknown property L"MultipleErrorMessages"
...
At a guess it's the object not being created correctly.
Is Mendeley addin for 32 or 64 bits?