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We always check, if the current executable (incl. path) is
the default aggregator. Your checkbox setting is saved to
the .settings.xml file within your %APPDATA%\RssBandit
folder. This setting will be reset to true again, if you
make RSS Bandit the default aggregator (to enable you will
be ask again, if another application take over the
ownership).
To verify what happens in your case: check,
the .settings.xml file gets written. Check, you don't start
two different versions of Bandit (from different folders)
after one another. They will share by default your %APPDATA%
\RssBandit folder! Check, the registry is written
successfully by searching for "feed".