FacebookCommenters plugin confict with my plugin

Hi
i am working on a plugin for localization Movable type to Persian (Farsi) for MT4.3.
for making dates work with Solar date(Persian), i must override format_ts in MT::Util package.

sub init_registry {
	my $new_format_ts = sub {
		require Farsi::Util;
		return Farsi::Util::new_format_ts(@_);
	};
	no warnings 'redefine';
	*MT::Util::format_ts = $new_format_ts;
}

but it worked fine until Six Apart introduced FacebookCommenters plugin(mt4.25), and after install FacebookCommenters my plugin works only in MT Admin, and no change in published blogs dates.

i want to know where is problem, it's from FacebookCommenters or mine?