I am not sure that Kovid's link is relevant to this case as the OP was using Googledrive rather than a network drive.
I have found that most of the common 'cloud' storage solutions work with Calibre (Dropbox, MegaCloud, Copy, Skydrive), but Googledrive does not. The reason is that Googledrive silently changes the filenames used by Calibre by removing the Id value that is in brackets and this causes the books to be disconnected from the Calibre database. I know that someone has written a small utility that can be run that corrects the names that Googledrive changes (using the metadata.opf file stored with each ebook) although I do not have a download link to hand.
Having said that other cloud solutions work, even with the ones that work you can get occasional glitches as the syncing process can temporarily make a file unavailable to Calibre. These can be lived with as they do not completely break Calibre.
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