In the following code cut/paste out of Chart.pm from the DBIx::Chart package, it appears to me that the execute subroutine is incorrectly reversing the order of the arguments.
Ie:

$dbh->execute($arg1, $arg2);
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becomes

$dbh->execute($arg2, $arg1);
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From DBIx::Chart:

sub execute {
    my ($sth, @args) = @_;

    return $sth->SUPER::execute(@args)
        unless $sth->{private_dbix_chart_sth};
#
#    first execute each source sth, then execute the chart sth,
#    passing in the source sth's as a param, and picking up any
#    other placeholders we might need
    my @exec_parms;
    my $chartsth = $sth->{private_dbix_chart_sth};

    my $src_sths = $chartsth->{_src_sths};
    my $src_phs = $chartsth->{_src_phs};
    my $chart_phs = $chartsth->{_chart_phs};
    my $phcnt = $chartsth->{_chart_src_idx};
    my $rc;
    foreach my $i (0..$#$src_sths) {
        @exec_parms = ();
        if (@args > 0) {
            push @exec_parms, $args[$_]   #<--line 403
                foreach (@{$src_phs->[$i]});
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I tracked down this section of code when trying to understand why a query was returning undef from execute. The query received two arguments and they were being transposed, which resulted in the undef. Changing line 403 from

push @exec_parms, $args[$_]
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to

unshift @exec_parms, $args[$_]
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seems to fix my problem without any adverse affects. I wonder, though, whether it's truly this simple? Surely this code is used enough (I've seen references to DBIx::Chart all over the place) that I'm not the first to see this. Is there some purpose in transposing the arguments that I haven't been able to discern?

Update: Linkified the references to the cpan module