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Same thing happens to me. I have run through diagnostic mode yet, but in my case it appears to have something to do with similar filenames inside one directory.
I believe that one application I have executes the following steps when you "save" the file you are working on:
--Assume you are working on "filexyz.suffix"
--The application saves it as "~filexyz.suffix"
--Once it is saved, it erases "filexyz.suffix"
--Renames "~filexyz.suffix" to "filexyz.suffix"
If this is a large file, and Google Drive tries to synch during this time, things go crazy, and I get the dreaded message that "primary key must be unique" and Google Drive must quit.
If I look at the "Google Drive" on my local hard drive, "~filexyz.suffix" is still there. If I look at my Google Drive on the web, I find two files. One named "filexyz.suffix" and one named "filexyz[conflict].suffix. Google Drive will not restart under these conditions.
If I erase "filexyz[conflict].suffix" and "~filexyz.suffix" then Google Drive will start.
This may not be the case, but it looks like Google Drive is ignoring "~" as part of a file name when generating a key for a data base entry to keep track of everything. Or it may not have anything to do with it. But it's a clue.