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If you use Vidalia to edit any torrc (including a pre-existing default torrc) that contains a hash-introduced comment on the same line with an option setting, like

SocksPort 9050 # this is the port that applications connect on

then you get an error like

Unacceptable option value: Int keyword 'SocksPort 9050 # this is the port that applications connect on' is malformed or out of bounds.

because Vidalia tried to validate the torrc and didn't realize that the comment was a comment. However, this doesn't seem to confuse Tor itself, so there's a gap between Vidalia's notion of torrc syntax and Tor's notion.