Endnote 7 Windows and Mac Library Problem

I have Endnote 7 on both a Mac and a Windows machine. I keep my library in Microsoft OneDrive (similar to Dropbox). Lately, after I have worked with a library in Mac Endnote, it will not open in the Windows machine (the Mac is turned off). I have had to recover the library several times. Any suggestions?

Suggestions?  I guess it would have to be – don’t use a drop-box like solution?  – With database files, it appears that parts can be overwritten corrupting the library. See this from their support site.