I recently observed this issue while using 2015 Beta on Win7-64, but could reproduce it on 2014 too.
Coloring of hash elements appears to toggle, line by line.
Please see attachment.
"Symbol coloring" => on
"Use Bold for ..." => on
"Highlight unidentified symbols" => on
Snippet...
use Modern::Perl;
# Module Handles
my %handles = (
h1 => \my $H1, # Why are these symbols
h2 => \my $H2, # colored differently?
h3 => \my $H3, # Coloring appears
h4 => \my $H4, # to alternate line
h5 => \my $H5, # by line
h6 => \my $H6, # by line
);