I do not have a solution, but I may have narrowed the problem for you. I ran your example (without updates) on Windows 7. The second instance does run, but does not return to the command window until I type a return. I suspect (without any real reason) that the problem is related to terminal I/O. I modified you program to avoid it (Removed both print statements). In order to verify that the second instance actually ran, I added an open statement to create a file. The resulting program runs to normal completion. The presence of the zero-length file in my current directory verifies that the second instance ran. I have no idea if this applies to windows 10 or if it will be of any help with the original Tk problem. 
#!/usr/bin/env perl
use warnings;
use strict;

my $pathToMyself = $0;

local $, = "\n\t* ";
local $\ = $/;
#print "\t".$^X, $0, @ARGV;

restartMe() unless @ARGV;
open my $foo, '>', 'UniqFileName.___';  # Look for file in CWD

sub restartMe {
#    print "Restarting $pathToMyself...\n";
    #exec( $^X, $pathToMyself ) or die "couldn't exec $pathToMyself: $
+!";
    #system(1, $^X, $pathToMyself, "don't Restart", "final" ); exit;
    #system(1, "cmd.exe", "/c", $^X, $pathToMyself, "final"); exit;
    exec("cmd.exe", "/c", $^X, $pathToMyself, "final") or die  "couldn
+'t exec $pathToMyself: $!";
}

[download]
Bill

In reply to Re^2: Restarting a Perl script on Windows 10 by BillKSmith
in thread Restarting a Perl script on Windows 10 by petro4213

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