Haven't had a chance to isolate what it was working on, but FWIW I did get the following at one point:

sub findwrappoint
  {
  my ($string, $width) = @_;
  my $cut = 0;
  my $char = 0;
  while( $string =~ /(\e[[\d;]*m)|([^ ]+)|( +)/g )
    {
    $3 and $char <= $width and $cut = $+[3];
    $char += $1 ? 0 : $2 ? length $2 : length $3;
[download]

(above line) Use of uninitialized value in addition (+) (repeated 3x)

    $char > $width and return substr( $string, 0, $cut, ''), $string;
    }
  return $string, '';
  }
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I'll follow up when I have better diagnostics.

Followup This string triggers the error for me:

my $string2 = qq{01:11:43:09 [CC] Roger. Go into BLOCK and we'll uplin
+k a new CSM state vector, and entry target load. 73 hours 00 minutes:
+ stop PTC 0 roll at 73; do a little more about that a little.};
my $width = 91;
my $first_indent = 15;
my $next_indent = 15;
say "\n$string2\n";
say ta_wrap(
    $string2, $width,
    {   flindent => ' ' x $first_indent,
        slindent => ' ' x $next_indent
    }
);

01:11:43:09 [CC] Roger. Go into BLOCK and we'll uplink a new CSM state
+ vector, and entry target load. 73 hours 00 minutes: stop PTC 0 roll 
+at 73; do a little more about that a little.

Use of uninitialized value in addition (+) at /Users/chap/private/perl
+/test_wrap line 28.
               01:11:43:09 [CC] Roger. Go into BLOCK and we'll uplink 
+a new CSM state
               vector, and entry target load. 73 hours 00 minutes: sto
+p PTC 0 roll at 73; do
               a little more about that a little.
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More followup

Here are a couple more inputs that trigger the same error. I should point out that none of these strings I've shown contains the '\e' escape sequence.

String=<<EOF;
05:08:28:30 [LMP] Mike, you get a waste-water dump at GET 30 plus 15 d
+egrees pitch to 0 degrees pitch to 0 degrees per hour with on the inc
+rease, and the force of impulsion will depend on the lunar attraction
+. It is very destructive, and ends by enlarging the bore of the count
+ry up across north of track. Over.
EOF
String=<<EOF;
02:02:40:59 [CC] Apollo 11 has got VHF A Simplex on whenever you are. 
+We're ready to start PTC at approximately 0 degrees per hour with on 
+the DSKY. Forward and up; now you are going over Mount Marilyn and th
+e shock be thereby destroyed. His object now was this with the coordi
+nates you have a recommended configuration for you. We'll just keep i
+t bearable. But since entering the cone of shadow these last two hour
+s, had the shell could not see Tranquility. What were you marking on?
+ Over.
EOF
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Found it

Doesn't like the word '0'. Changed

$char += $1 ? 0 : $2 ? length $2 : length $3;
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to

$char += $1 ? 0 : defined $2 ? length $2 : length $3;
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