Vidalia should check if Tor supports an option before applying
In Vidalia, config options are being applied without checking if the Tor version supports it preventing the user from using Tor.
Commit 8c67821 in Vidalia alpha tries to use a DisableNetwork option supported only from Tor 0.2.3.9-alpha preventing it from starting Tor.
Vidalia should check using GETINFO config/names to see if it is supported by the installed Tor version. Else, it should inform the user that the option would be ignored and ask permission to continue.