In sub winWritablePath in OSDetect.pm, the path to prefs, cache, etc is set to:
$root = catdir($swKey->{'Common AppData'}, 'SqueezeCenter');
This typically resolves to:
C:\Documents and Settings\All Users\Application Data\SqueezeCenter

When running several branches (for instance 7.0 and trunk), this means that the different versions modify data in the same directory.
It would be nice if version specific sub-directories were used inside the SqueezeCenter directory so that the directory structure looked something like:
C:\Documents and Settings\All Users\Application Data\SqueezeCenter\7.0
C:\Documents and Settings\All Users\Application Data\SqueezeCenter\trunk