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Example:
User creates a file named "foo/bar?.txt" in MacOS (? is an invalid character in windows). Under windows the file will not download and the folder appears to be empty. The user can try to m...
I absolutely agree with Ricko. I've just been bitten by this and wasted far too much time working out why my "complete" (i.e., not Selective Sync'd) copy of Dropbox on my PC was actually far from complete. Simply having an option on the bad_files_check page to replace all the invalid characters with a '-' would be good enough for me.
For now I wrote a quick-and-dirty Python script on my Mac to rename all the bad files.