@da_jane - if you switch to another library (e.g an empty one) does dropbox synch the metadata.db file of your main library.
I used SkyDrive for a short while and saw the same issue, btw that was many months before the new d/b backend was implemented. This was acceptable to me as I am not sure what 'state' an open for read/write SQLite file is likely to be in at any given moment in time.
I only used Skydrive to get a feel for these cloud synch services, before I went back to my long standing and trusted commercial FTP supplier.
BR
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