My .hgignore file is being ignored!
If you create a repository outside MacHg and add it to MacHg you
might find that the .hgignore file itself in the
repository is being ignored by MacHg. This will be due to an ignore
pattern somewhere on your hgignore
path.
From the terminal you can
use the mercurial command hg debugignore to return the
regular expression which is used by MacHg to determine exactly
which files are being ignored by MacHg.
See this bug report for more info.