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Originally Posted by JockM View Post
This isn't really the place for an in depth technical conversation. But I will share this little tidbit: if you always use the dropbox REST API to write and test the existence of a lock file, then it will work consistantly
Huh! My understanding is that DropBox stores its data on Amazon S3, and the Amazon S3 data consistency model explicitly does not support read-after-write consistency (such as what we'd need to be able to rely on lock file tests).

Are you saying that DropBox's REST API makes consistency guarantees not made by the underlying Amazon S3 data store?